Một số bài toán về kỹ thuật tính
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (58.44 KB, 8 trang )
KỸ THUẬT TÍNH
Bài 1: Tính nhanh (áp dụng tính chất của phép nhân, chia)
a) 54 × 113 + 45 × 113 + 113
= ..........................................................................................................................................
= .........................................................................................................................................
= ..........................................................................................................................................
b) (145 × 99 + 145) - (143 × 101 - 113)
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
c) 253 × 75 - 161 × 37 + 253 × 25 - 161 × 63
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
d) 37 × 1997 + 1997 × 2 + 1997 + 59 × 1997 + 1997
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
đ) 364 × 75 - 278 × 78 + 25 × 364 - 278 × 22
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
e) 675 : 135 - 405 : 135
= ..........................................................................................................................................
= .........................................................................................................................................
= ..........................................................................................................................................
g) 3968 : 248 + 744 : 248 - 2232 : 248
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
h) 2468 × 321 - 201 × 2468 - 2468 × 101 - 18 × 2468
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
i) 100 × 47 - 58 - 12 × 35 : 10
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
Bài 2: Tính nhanh (phân tích 1 thừa số)
a) 27 × 6 + 24 × 12 + 50 × 3
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
b) 532 × 7 - 266 × 14
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
c) 378 × 132 - 64 × 189
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
d) 32 × 4 + 78 × 2 - 7 × 12
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
Bài 3: Tính nhanh
a) 2 ×
10 2 20 8 5
+ × + ×
8 3 16 18 4
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
1 3 18 5 23 9
b) + + + + + × 2
4 4 23 23 32 32
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
Bài 4: Tính nhanh
a) (572 × 7 + 266) × (336 × 9 - 168 × 18) × (348 × 6 - 348)
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
b) (1 + 3 + 5 + 7 + ... + 97 + 99) × (45 × 3 - 45 × 2 - 45)
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
c) (180 : 15 - 132 : 11) × (57869 - 297 : 11 × 108)
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
Bài 5: Viết tổng sau thành tích của hai thừa số:
a) 15 + 27 + 93 + 126 + 45
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
b) 225 + 625 + 475 + 925 + 700
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
c) 18 + 36 + 63 + 81 + 126 + 306
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
.............................................................................................................................................
.
