x^3+5x^2y+x^2 化简

化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 数学(x-y)^5*(y-x)^3*(x-y)^2 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简：3x（2x+y)-2x(x-y) x是字母x不是乘号 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 (2X-3y)-(5x-y) 化简 (x+y)(x²-xy+y²) ； 3（2x-1）(x+6)-5(x-3)(x+6) [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x) 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)