Question

（xy-x²）÷x-y/xy 4x²-1/x²+x乘x+1/1-2x÷1/x

（xy-x²）÷x-y/xy
4x²-1/x²+x乘x+1/1-2x÷1/x
这两题是分开的！

Answer 1

x（y-x）÷x-y/xy=x²y
4x²-1/x²+x乘x+1/1-2x÷1/x
=(2x-1)(2x+1)/x(x+1)*(x+1)/(1-2x)÷1/x
=-2x-1

Answer 2

（xy-x²）÷x-y/xy
=x(y-x)÷(x-y)/xy
=-1/y

4x²-1/x²+x乘x+1/1-2x÷1/x
=(2x-1)(2x+1)/x(x+1)*(x+1)/(1-2x)÷1/x
=-2x-1

追问

能把a-b/a²+ab乘a²b²-a四次方/ab-a²
解一下

追答

a-b/a²+ab乘a²b²-a四次方/ab-a²
=(a-b)/a(a+b)×a²(a-b)(a+b)/a(b-a)
=b-a