因式分①x2-4x+3②x2y+5xy-36y③9-x2+2xy-y2.-数学

题目简介

因式分①x2-4x+3②x2y+5xy-36y③9-x2+2xy-y2.-数学

题目详情

因式分
①x2-4x+3
②x2y+5xy-36y
③9-x2+2xy-y2
题型:解答题难度:中档来源:不详

答案

①x2-4x+3=(x-1)(x-3);

②x2y+5xy-36y=y(x2+5x-36)=y(x-4)(x+9);

③9-x2+2xy-y2=9-(x2-2xy+y2)=9-(x-y)2=(3-x+y)(3+x-y).

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