已知a与b互为相反数,c与d互为倒数,x=3(a-1)-(a-2b) y=c^2d-[(d/c)+c-1],求2x+y/x-y加上3x-2y/y-x y=c^2d+d^2-[(d/c)+c-1],

问题描述:

已知a与b互为相反数,c与d互为倒数,x=3(a-1)-(a-2b) y=c^2d-[(d/c)+c-1],求2x+y/x-y加上3x-2y/y-x
y=c^2d+d^2-[(d/c)+c-1],