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vietanheduninhbinh
2 năm trước
Chứng minh rằng 1/ (a+b)-(b-a)+c=2a+c 2/ -(a+b-c)+(a-b-c)=-2b 3/ a×(b+c)-a×(b+d)=a×(c-b) 4/ a×(b-c)+a×(d+c)=a×(b+d) Giải đc câu nào thì giải nhé ! Nhg mình mg là 2 câu trở lên ( mong v thôi nha !)
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