作业帮麻烦回答一下下面两题.3Q very much
来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/27 13:15:05
麻烦回答一下下面两题.3Q very much
[-xy/(x-y)²]^4*[(x²-xy)/x]³*x^4/y^10÷[x/(xy-y²)]^5 x=-2 y=4
=x^4y^4/(x-y)^8*(x-y)^3*x^4/y^10*y^5(x-y)^5/x^5
=x³/y
=(-2)³/4
=-8/4
=-2
①个 y/x(x+y）
②个 y/(x²-y²)
③个 x/y(x-y)
通分：
y/x(x+y)=(xy-y²)/x(x+y)(x-y)
y/(x²-y²)=xy/x(x+y)(x-y)
x/y(x-y)=(x²+xy)/x(x+y)(x-y)
=x^4y^4/(x-y)^8*(x-y)^3*x^4/y^10*y^5(x-y)^5/x^5
=x³/y
=(-2)³/4
=-8/4
=-2
①个 y/x(x+y）
②个 y/(x²-y²)
③个 x/y(x-y)
通分：
y/x(x+y)=(xy-y²)/x(x+y)(x-y)
y/(x²-y²)=xy/x(x+y)(x-y)
x/y(x-y)=(x²+xy)/x(x+y)(x-y)