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ngocgiang1310
2 năm trước
Bài 1 : tính  a) (-9) . 7 b) (-15) . 10  c) (-7) . 0  d) (-15) . (-4) + 5 . (-15) Bài 2 ; so sánh  a) (-7) . 10 và 0  b) (-11) . (-12) và (-10) . (-13) Baiif 3 : tìm x biết  a) 5 . x = 105  b) x : 11 = 121 c) (x^2 + 1) . (x-2) = 0 d) (x - 1) . ( x - 4) < 0
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