-3xy(xy-x^2-2x^2y^3+1),
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-3xy(xy-x^2-2x^2y^3+1),-3xy(xy-x^2-2x^2y^3+1),-3xy(xy-x^2-2x^2y^3+1),=-3x*2y*2+3x*3y+6x*3y*4-3xy-3xy
-3xy(xy-x^2-2x^2y^3+1),
-3xy(xy-x^2-2x^2y^3+1),
-3xy(xy-x^2-2x^2y^3+1),
= -3x*2y*2+3x*3y+6x*3y*4-3xy
-3 x y + 3 x^3 y - 3 x^2 y^2 + 6 x^3 y^4
2x²y-3(2xy-xy)-xy
3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程
计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x）
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
（X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程
计算：3xy[2xy-x（y-2）+x]
计算3xy[2xy-x(y-2)+x-1]
（-3x^y+2xy)-( )=4x^+xy
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
x^2-xy-6y^2+3xy+y+2
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x，
因式分解：(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)
化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]}
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
(-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)]