化简: (1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-1/2x); (2)(-4x2+12x3y2-16x4y3)÷(-4x2)-(-2xy2-y)(-2xy-1).

问题描述:

化简:
(1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-

1
2
x);
(2)(-4x2+12x3y2-16x4y3)÷(-4x2)-(-2xy2-y)(-2xy-1).

(1)[(x+2y)(x-2y)-(2x-y)2+(3x-y)(2x-5y)]÷(-12x),=(x2-4y2-4x2-y2+4xy+6x2+5y2-17xy)÷(-12x),=(3x2-13xy)÷(-12x),=-6x+26y;(2)(-4x2+12x3y2-16x4y3)÷(-4x2)-(-2xy2-y)(-2xy...