5(a-b)²-a+b等于几
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5(a-b)²-a+b等于几
5(a-b)²-a+b等于几
5(a-b)²-a+b等于几
5(a-b)²-a+b
=5(a-b)²-(a-b)
=(a-b)(5(a-b)-1)
=(a-b)(5a-5b-1)
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5(a-b)²-a+b
=5(a-b)²-(a-b)
=(a-b)(5a-5b-1)
5(a-b)²-a+b
=5(a²-2ab+b²)-a+b
=5a²-10ab+b²-a+b