(x-2y)3怎么算?

(2x-3y)-(5x-y)怎么算 (x-y)^2(y-x)^3怎么算啊, (y-x)(x-y)^3(y-x)^5怎么算 (x-2y)^m+1/(x-2y)^m-3/(2y-x)^3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 y+(1+x)(2+x)(3+x)导数怎么算, 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 -(1+3X-2Y)怎么算 (x-2y)3怎么算? x-y+2y的平方/x+y怎么算? (x+y)(x-y)+3y^2怎么做? (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, (x+y)^2-(x^3+y^3)除以（x+y） (x^3+y^3)除以（x+y）这部分怎么算? y=-(2x+3)/x^2求导怎么算? 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? 方程组：5Y＝3X,2X+2＝X+2Y怎么算