-3(2x^2-xy)+4(x^2+xy-6)
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-3(2x^2-xy)+4(x^2+xy-6)-3(2x^2-xy)+4(x^2+xy-6)-3(2x^2-xy)+4(x^2+xy-6)-3(2x^2-xy)+4(x^2+xy-6)=-6x^2+3
-3(2x^2-xy)+4(x^2+xy-6)
-3(2x^2-xy)+4(x^2+xy-6)
-3(2x^2-xy)+4(x^2+xy-6)
-3(2x^2-xy)+4(x^2+xy-6)
= - 6x ^2 +3xy +4x^2 + 4xy -24
= - 2x ^2 +7xy -24
3xy(x^2-xy^2+xy)-xy^2(2x^2-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
-3(2x^2-xy)+4(x^2+xy-6)
（-3x^y+2xy)-( )=4x^+xy
4(x²+xy-6)-3(2x²-xy)
-3(2x²-xy)+4(x²+xy-6)
(-3xy+2xy)-(4xy+xy)
因式分解X^3-2xy+xy^2
化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy]
2x²y-3(2xy-xy)-xy
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2)
3(x^2y+xy)-4(xy-2x^2y)-(-xy)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
当x-y=2xy时,求4x-3xy-4y/xy
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
3（x平方y+xy)-4(xy-2x平方y)-(xy)