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mychung1980
2 năm trước
giải gấp giúp em bài này ạ ghi đầy đủ rõ ràng có bước trung gian B20:tìm x c) (x-25):3=-8 e)64-3x=124 f)-3x+1=25-32 g)143-2.(x+1)=-69 h)76-5.(3-2x)=181 B22: tính hợp lí a) (27-7).(-4)+31.(-12-8) b) 135+(-241)-135+141 c)(43-13).(-9)+21.(-16-14) d) -(153-170-915)+(15+153-170)
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