2x-y=-1怎么算

X^2-2XY+Y^2-X+Y-2=0怎么算等于(x-y-2)(x-y+1)? 2x-y=-1怎么算 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? y=(x+1)(x+2)的反函数怎么算 X^2Y+Y=X^怎么转换成X^=1-Y分之Y (2x+y-1)(2x+y-1)怎么算 |x-y+2|=|x+y+2|怎么算? (x/y)2-(x/y)=1怎么解? y/(x+y)-x/(x-y)=?怎么算? x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算? x^2-4Y^2+X+3Y-1=0 2X-Y-1=0 怎么算 (2x+y-1)(2x-y-1)=?和（3x+y-5a）的平方怎么算 (x-2y)^m+1/(x-2y)^m-3/(2y-x)^3怎么算 整数x,y满足方程2xy+x+y=83,则x+y怎么算 y+(1+x)(2+x)(3+x)导数怎么算, x-y分之1=-1 x+y分之1=2　怎么算啊 x+2y/2 = 2x-y/3 = 1怎么算? 2x+y=2 { 4x-y=1怎么算