计算:(1)(-x²/y)·(-y²/x)³÷(-y/x）的4次方；(2)2x-6/4-4x+x²·x-2/x+3÷3-x/x²-4；(3)(a²-b²/b)²÷(a²+ab)·(ab/b-a)²；(4)(1-x/3-x)²÷(x²-6x+9/9-x²)²·1/x²-2x+1

计算:(1)(-x²/y)·(-y²/x)³÷(-y/x）的4次方；(2)2x-6/4-4x+x²·x-2/x+3÷3-x/x²-4；(3)(a²-b²/b)²÷(a²+ab)·(ab/b-a)²；(4)(1-x/3-x)²÷(x²-6x+9/9-x²)²·1/x²-2x+1
计算:(1)(-x²/y)·(-y²/x)³÷(-y/x）的4次方；
(2)2x-6/4-4x+x²·x-2/x+3÷3-x/x²-4；
(3)(a²-b²/b)²÷(a²+ab)·(ab/b-a)²；
(4)(1-x/3-x)²÷(x²-6x+9/9-x²)²·1/x²-2x+1

计算:(1)(-x²/y)·(-y²/x)³÷(-y/x）的4次方；(2)2x-6/4-4x+x²·x-2/x+3÷3-x/x²-4；(3)(a²-b²/b)²÷(a²+ab)·(ab/b-a)²；(4)(1-x/3-x)²÷(x²-6x+9/9-x²)²·1/x²-2x+1