(2x-3y)-(5x-y)怎么算

(y-x)(x-y)^3(y-x)^5怎么算 (2x-3y)-(5x-y)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 (x-y)^2(y-x)^3怎么算啊, (2X+3Y)(-2X-5Y)怎么做 3(y-x)^2+5(x-y)^2怎么解 分式5/x-y+3/(x-y)^2怎么解? （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 方程组：5Y＝3X,2X+2＝X+2Y怎么算 x-y+2y的平方/x+y怎么算? (x+y)(x-y)+3y^2怎么做? (x-2y)^m+1/(x-2y)^m-3/(2y-x)^3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)=? (2x+y-1)(2x-y-1)=?和（3x+y-5a）的平方怎么算 化简:5(x-y)+2(x+y)-3(x-y) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)