计算:(x-y)2-(-x+y)(x+y)-数学

题目简介

计算:(x-y)2-(-x+y)(x+y)-数学

题目详情

计算:(x-y)2-(-x+y)(x+y)
题型:解答题难度:中档来源:不详

答案

(x-y)2-(-x+y)(x+y)=x2-2xy+y2-(-x2-xy+xy+y2)=x2-2xy+y2+x2+xy-xy-y2=2x2-2xy;

更多内容推荐