1.化简求值：已知x/y=二分之一求(2x/x²-2xy+y²)*(x²-y²/x+y)+2y/x-y2.计算(x²/x²-1)-x-1

Question

1.化简求值：已知x/y=二分之一 求(2x/x²-2xy+y²)*(x²-y²/x+y)+2y/x-y
2.计算(x²/x²-1)-x-1

Answer 1

1.y=2x,带入公式化简
（2/x-4x²+4x²）（x²-4x+2x）+2-2x
=2/x(x²-2x)+2-2x
=2x-4+2-2x
=-2
2.(x²/x²-1)-x-1
=(1-1)-x-1
=-x-1