(2y+3x)(-3x-2y)怎么解

[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 【x-3y][x+y]-[x-2y][x +2y]-[x-y (2x-3y)-(5x-y)怎么算 有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【- x-y=2y 0.2x+3y=1 这个二元一次方程怎么解? 计算(x+y)(x+y)^2(-x-y)^3 数学(x-y)^5*(y-x)^3*(x-y)^2 (2x-3y)2-(4y-3x)(3x+4y)怎么做? [(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做? （x-y)^3*(x-y)^2*(y-x)这道题怎么算 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y