(2x3-3x2y-2xy2)-(x3-2xy2+y3)+(-x3+3x2y-y3)当x=1/2,y=-1时,求值.当x=-1/2,y=-1时,求值.

x3-2x2y+xy2-x 因式分解:x3-2x2y+xy2 (X3-2x2y+xy2)÷（x3-xy2）要求约分 x3+2x2y+2xy2+y3因式分解 分解因式：x3+xy2－2x2y 若m=x3-3x2y+2xy2+3y2 n=x3-2x2y+xy2-5y3,则2x3-7x2y+5xy2+14y2等于( )若m=x3-3x2y+2xy2+3y2 n=x3-2x2y+xy2-5y3,则2x3-7x2y+5xy2+14y2等于( )空里用字母表示 x.y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3).y取何值时，代数（x3y+3x2y-5xy2+6y3）+（y3+2xy2+x2y-2x3）-（4x2y-x3-3xy2+7y3）的值都是常数? 试说明代数式(x3+3x2y-4xy2+6y3)-(2x3-x2y-xy2-y3-1)+(x34x2y+3xy2-7y3)的值与xy取值无关 (4xy2-2x2y)-( )=x3-2x2y+4xy2+y3． 分解因式:X3+2X2Y+2XY2+Y3= 试说明:无论x,y取何值时,代数式(x3+3x2y-5+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y2)的值是常数.要具体过程,注意格式 3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)] 因式分解：x3-y3-x2y+xy2 x3+x2y-xy2-y3= (2x3-3x2y-2xy2)-(x3-2xy2+y3)+(-x3+3x2y-y3)当x=1/2,y=-1时,求值.当x=-1/2,y=-1时,求值. 已知x>y,试比较x3-x2y+xy2与x2y-xy2+y3的大小!题中的2、3均为x、y 的2、3次方!急 x3+y3--x2y--xy2分解因式在线等．3和2是指数!－－减号急,要过程 x3-xy2+x2y-y3(3是立方,2是平方)谢谢你们```我晚上之前就要写好```