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vienvan724
2 năm trước
a) x ( x^ -y) -x^ ( x+y) +y ( x^ -x)= b) ( a+ b )^ -2ab= c) ( a+b ) mũ 3 - 3ab ( a+b)= mik k biết ghi dấu mũ nên : "^" cái này là mũ 2 ///////mũ 3 mik ghi thẳng chữ vào lun
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