3xy[2xy-3(xy-1/2x^2y)]
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3xy[2xy-3(xy-1/2x^2y)]3xy[2xy-3(xy-1/2x^2y)]3xy[2xy-3(xy-1/2x^2y)]3xy[2xy-3(xy-1/2x^2y)]=3xy[2xy-3xy
3xy[2xy-3(xy-1/2x^2y)]
3xy[2xy-3(xy-1/2x^2y)]
3xy[2xy-3(xy-1/2x^2y)]
3xy[2xy-3(xy-1/2x^2y)]
=3xy[2xy-3xy+3/2x^2y]
=3xy[-xy+3/2x^2y]
=-3x^2y^2+9/2x^3y^2
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