已知x-3y=0,求(2x+y)(x-y)x2-2xy+y2的值.-数学

题目简介

已知x-3y=0,求(2x+y)(x-y)x2-2xy+y2的值.-数学

题目详情

已知x-3y=0,求
(2x+y)(x-y)
x2-2xy+y2
的值
题型:解答题难度:中档来源:不详

答案

∵x-3y=0,
∴x=3y,
∴原式=
(2x+y)(x-y)
(x-y)2
=class="stub"2x+y
x-y
=class="stub"6y+y
3y-y
=class="stub"7
2

故答案为class="stub"7
2

更多内容推荐