3x^2y-[2xy^2-2(xy-3/2x^2y)+xy]+3xy^2,X=3y=-1/3(化筒求植,
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2x²y-3(2xy-xy)-xy
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
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(-3x^y+2xy)-( )=4x^+xy
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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)]
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