(2x-y+1)*怎么算?

(2x+y-1)(2x+y-1)怎么算 (x-2y)^m+1/(x-2y)^m-3/(2y-x)^3怎么算 y+(1+x)(2+x)(3+x)导数怎么算, 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 (2x-y+1)*怎么算? -(1+3X-2Y)怎么算 x-y+2y的平方/x+y怎么算? (2x^3y^3-2x^3y+1/8^4+y)/(-1/2x^3y)怎么算! [(2X+Y)*(2X+Y)-Y(Y+4X)]/2X 怎么算? (x-y)^4·(x-y)-2(y-x)³·（y-x)²怎么算, y=(x+1)(x+2)的反函数怎么算 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? 9(x+y)2-(x-y)2怎么算,还有：（x-2）（x-4）+1和：（x+y）²-4（x+y-1） [(x+y)的平方—(x+y)(x—y)]除以2y怎么算 X^2Y+Y=X^怎么转换成X^=1-Y分之Y |x-y+2|=|x+y+2|怎么算? (2x-3y)-(5x-y)怎么算