2x+5,3y-3,x+y,10 的平均数怎么算

[(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答 5x^3y(x-y)^3-10x^4y^3(y-x)^2因式分解 5x^3y(x-y)^3-10x^4y^3(y-x)^2 (x+5y)^+(2x+10y)(3x-y)+(3x-y)^ (x+5y)²-(2x+10y)(3x-y)+(3x-y)² 5X^3Y(X-Y)-10X^4Y^3(Y-X)^2因式分解 (x+5y)的平方+(2x+10y)(3x-y)+(y-3x)的平方 (x+y-5)+|3y-2x+10|=0,求 x,y的值 [(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)请帮我一下写两道计算题[(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)[（3x+2y）（3x-2y）-（x+2y）（5x-2y）]除以（4x） 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) (3x-y)的平方-(2x+y)的平方-5(x-y),化简(3x-y)的平方-(2x+y)的平方-5(x-y)化简 (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 5x=3y,(2x+y)的平方=5x(x+y)+9 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian