(x^2+y^2)^2怎么算?

x-y+2y的平方/x+y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, 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? [(x+y)的平方—(x+y)(x—y)]除以2y怎么算 (2x+y-1)(2x+y-1)怎么算 |x-y+2|=|x+y+2|怎么算? (2x-3y)-(5x-y)怎么算 (x-y)^2(y-x)^3怎么算啊, (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 (x+y)(x-y)+3y^2怎么做? 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 y+(1+x)(2+x)(3+x)导数怎么算, （x-y)^3*(x-y)^2*(y-x)这道题怎么算（x-y)^3*(x-y)^2*(y-x)看不懂？（x-y)^3乘(x-y)^2乘(y-x)总可以了吧 (x^2+y^2)^2怎么算? X^2-2XY+Y^2-X+Y-2=0怎么算等于(x-y-2)(x-y+1)? 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算