3x÷(x-4y)+x+y÷(4y-x)-7y÷(x-4y)解方程

x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y 4x-3y/x-2y÷6y-8x/y-2x 计算：(x-y)^8÷(y-x)^4×(x-y) [4(x+y)平方-x-y]÷(x+y) 3x÷(x-4y)+x+y÷(4y-x)-7y÷(x-4y)解方程 （y-x)+x(x-y)^3-(y-x)^4 因式分解 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 先化简再求值:[(x+3y)(x-3y)-(x+3y)^2]÷4y 【(3x-2y)^2-(4x+y)(4y-x)】÷3x 计算 3x+4y/x-y+3y/y-x-4x/x-y 3x+4y/x-y +3y/y-x -4x/x-y x(4y-x)(x-3y)+y(3y-x)(x-4y)因式分解 [(5X+3Y)(4X-3y)-(X+3Y)(X-3Y)]÷(-4X) 计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² 计算：[（x+y）³-2(x+y)²-4(x+y)]÷（x+y) [4y(2x-y)-2x(2x-y)]÷(2x-y)