de kiem tra 1 tiet toan 7 co ban 31895
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Bài kiểm tra một tiết đề 1
Họ và tờn:
Lớp:
Bài 1 ( 2.5 điểm) Tính
a.
3 6
4 5
3
4
b. 2
3
7
c.
3 5
2
5
3
d. 210.2 3
e. 36.27.812
f.
420 6
70 6
Bài 2.( 3 điểm) Tìm x, biết:
a.
3
1
x
7
3
4
3
b. 3 x
2
5
c.
x 3
2 5
d.
2x 3 3
5
2
Bài 3:(3 điểm) Tìm x, y biết:
a.
x y
và x + y = 21
3 4
b.
x y
và 2 x 3 y 38
2 5
Bài 4:(1.5 điểm) Tính x, y, z biết:
x y z
và 5 x y 2 z 56
10 6 21
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