化简：x(x-5y)-(x-3y)²＋5x

化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x 化简 (x+y)(x²-xy+y²) ； 3（2x-1）(x+6)-5(x-3)(x+6) (y-x)(x-y)^3(y-x)^5怎么算 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) (x+y)²+4(x+y)-5 (2X-3y)-(5x-y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 (3x-y)²-2x（4x-5y）-（x+2y）² 合并同类项：-6x²y-x+5x²y-2x+x³y+3x 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)