Đề kiểm tra 1 tiết Đại số lớp 7
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TRƯỜNG THCS THỊ TRẤN ĐU
Họ và tên: ................................................................
Lớp: 7……
BÀI KIỂM TRA
Môn: Đại số 7
(Thời gian làm bài: 45 phút)
ĐIỂM
ĐỀ BÀI
Câu 1 (3 điểm): Thực hiện phép tính:
Câu 2 (2,5 điểm): Tìm x biết:
Câu 3 (1,5 điểm): Tính giá trị của biểu thức:
Câu 4 (2 điểm): Hưởng ứng phong trào “Nuôi lợn nhựa tiết kiệm”, cuối học kì I,
bốn chi đội 7A, 7B, 7C, 7D thu được tổng số tiền là 780 nghìn đồng. Biết rằng số
tiền của bốn chi đội lần lượt tỉ lệ với 8, 6, 7, 5. Hãy tính số tiền mà mỗi chi đội thu
được?
Câu 5 (1 điểm): So sánh: và
BÀI LÀM
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Đáp án
Điểm
Câu
1đ
1đ
1
1đ
2
hoặc hoặc
(ĐK: )
(thỏa mãn)
Vậy x = 6
0,75đ
1đ
0,75đ
3
1,5đ
4
Gọi số tiền mà các chi đội 7A, 7B, 7C, 7D thu được lần lượt là x, y, z,
t (nghìn đồng) (0 < x, y, z, t < 780)
Vì bốn chi đội 7A, 7B, 7C, 7D đã thu được tổng cộng 780 nghìn đồng
nên ta có: x + y + z + t = 780 (1)
Vì số tiền thu được của bốn chi đội lần lượt tỉ lệ với 8, 6, 7, 5 nên ta
có:
(theo (1))
Từ đó, ta tính được: x = 240; y = 180; z = 210; t = 150 (thỏa mãn)
Vậy lớp 7A thu được 240 nghìn đồng, lớp 7B thu được 180 nghìn
đồng, lớp 7C thu được 210 nghìn đồng, lớp 7A thu được 150 nghìn
đồng.
Ta có: ;
2đ
Mà 27 > 25 > 0 nên
Vậy
5
1đ
