( )-(x^2+3xy)=-xy-1/3y^2
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()-(x^2+3xy)=-xy-1/3y^2()-(x^2+3xy)=-xy-1/3y^2()-(x^2+3xy)=-xy-1/3y^2()-(x^2+3xy)=-xy-1/3y^2()=(x^2+
( )-(x^2+3xy)=-xy-1/3y^2
( )-(x^2+3xy)=-xy-1/3y^2
( )-(x^2+3xy)=-xy-1/3y^2
( )-(x^2+3xy)=-xy-1/3y^2
( )=(x^2+3xy)+(-xy-1/3y^2)
( )=x^2+3xy-xy-1/3y^2=x^2-2xy-1/3y^2
所以括号里写x^2-2xy-1/3y^2
( )=-xy - 1/3y^2 + (x^2+3xy)
=-xy - 1/3y^2 +x^2 + 3xy
=x^2 + 2xy - 1/3y^2
因式分解x^3+2xy-x-xy^2=
化简:xy分之3x^2+2xy-xy分之2x^2-xy=
（-3x^y+2xy)-( )=4x^+xy
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