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kienhp95x
2 năm trước
Bài Tập Câu 1:Thực hiện các phép tính sau: a)(-15).(-4) b)(-20).(-6) c)20.7 d) (+5).(+11) Câu 2:Thực hiện các phép tính sau: a) (-6).9 b) 23.(-7) c) (-250).(+8) d) (+4).(-3) Câu 3: So sánha) (-9).(-8) với 0 b) (-12).4 với (-2).(-3) c) (+20).(+8) với (-19).(-9) Câu 4:Tính giá trịcủa biểu thức: (12 -17).x khi x = 2, x = 4, x = 6 câu 5:Viết các tổng sau thành dạng tích và tính giá trị khi x = -5:a, x + x + x + x + xb, x –3 + x –3 + x –3 + x -3 Câu 6: Tính hợp lý a)35. 18 –35. 28 b)54 –6. (12 + 9) c)24. (16 –5) –16. (24 -5) d)29. (19 –13) –19. (29 –13) Câu 7:Tìm x biết :a)(2x –5) + 17 = 6 b)10 –2(4 –3x) = -4 c)-12 + 3(-x + 7) = -18 d)24 : (3x –2) = -3
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