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phuongthuytfboy
2 năm trước
tính 1. (-1)×(-4)×5×8×y với y=25 2. (2ab²)÷c với a=4;b=(-6);c=12 3. [(-25)×(-27)×(-×)]÷y với x=4;y=(-9) 4. (a²-b²)÷(a+b)×(a-b) với a=5;b=(-3) giúp mik với
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