5/12[-4/3（x-y）^3] *（x+y）^2 * (-x-y)^3 * 5/6(y-x)^2

5/12[-4/3（x-y）^3] *（x+y）^2 * (-x-y)^3 * 5/6(y-x)^2 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 2(x-y)+3（x+y）2-5(x-y)-8（x+y）2-（x-y） (3x-y)²-2x（4x-5y）-（x+2y）² 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) 数学(x-y)^5*(y-x)^3*(x-y)^2 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 2(2x+3y)(3x+2y)-(6x-y)(2x-5y) （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27