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