早教吧作业答案频道 -->数学-->
已知x=3y,求2x+y/x05-2xy+y05×(x-y)的值已知x-3y=0,求(2x+y)/(x2-2xy+y2)×(x-y)的值
题目详情
已知x=3y,求2x+y/x05-2xy+y05×(x-y)的值
已知x-3y=0,求【(2x+y)/(x2-2xy+y2)】×(x-y)的值
已知x-3y=0,求【(2x+y)/(x2-2xy+y2)】×(x-y)的值
▼优质解答
答案和解析
[(2x+y)/(x²-2xy+y²)]·(x-y)
=[(2x+y)/(x-y)²]·(x-y)
代入x=3y
原式=(7y/4y²)·2y
=(7/4y)·2y
= 7/2
=[(2x+y)/(x-y)²]·(x-y)
代入x=3y
原式=(7y/4y²)·2y
=(7/4y)·2y
= 7/2
看了已知x=3y,求2x+y/x0...的网友还看了以下: