ab-a+b-1=___.m²+n²+6n-2mn-6m+9=___.
人气:120 ℃ 时间:2020-03-27 09:23:27
解答
ab-a+b-1
=a(b-1)+(b-1)
=(a+1)(b-1)
m2+n2+6n-2mn-6m+9
=(m+n)2-6(m+n)+9
=(m+n-3)2
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