已知2x+y÷2=5x+2y÷4=1,求（x+2y+1）÷(2x-3y+7)的值

已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值. 已知：【（x²+y²）-（x-y)²+2y（x-y)】÷4y=,求4x/（4²-y²）-1/（2x+y)的值已知：【（x²+y²）-（x-y)²+2y（x-y)】÷4y=1，求4x/（4²-y²）-1/（2x+y)的值 已知x²+4y²-4x+4y+5=0,求(2x-y)(x+y)/x四次方-y四次方×xy-y²/2x-y÷(y/x²+y²)² 已知x=y+2,求[(x+y)(x-y)-(x-y)的2次方+2y(x-y)]÷4y的值 1.已知2x+y=4,求这个整式[(x+y)^2-(x-y)^2-2y(x-1/2 y)]÷4y的值 已知2x+y=4,求代数式[(x+y)²-(x-y)²-2y(x-1/2y)]÷4y的值 已知2x+y=4,求代数式[(x+y)²-(x-y)²-2y(x-1/2y)]÷4y的值 （还没学因式分解） 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知、5x²-2xy+y²+4x=1=0求[(x+y)(x-y)-(x-y)²+2y(x-3y)]÷(-4y)的值 已知x²-y²=10,求[（x+y）³-2y(x+y)²-4(x+y)]÷(x+y)的值 已知x²-y²=10,求[(x+y)的三次方-2y(x+y)²-4(x+y)]÷(x+y)的值 已知4y^2+4y+1+|x-1|=0 求[(x-2y)^2-(2x+y)(2x-y)+(3x-y)(x+y)]÷（2y）的值 已知x+4y-2x+8y+5=0,求x^4-y^4/2x+xy-y·2x-y/xy-y÷(x+y/y)的值.数学上交不不算请教下. 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-y2-1/2x+y的值如图