(-3分之一xy)的平方【xy(2x-y)-2x(xy-y的平方)】
=9分之1x²y²【2x²y-xy²-2x²y+2xy²】
=9分之1x²y²*xy²
=9分之1x³y^4
=9分之1×(-2分之3)³×(-2)^4
=9分之1×(-8分之27)×16
=-8分之3×16
=-6
(-3分之一xy)的平方【xy(2x-y)-2x(xy-y的平方)】
=9分之1x²y²【2x²y-xy²-2x²y+2xy²】
=9分之1x²y²*xy²
=9分之1x³y^4
=9分之1×(-2分之3)³×(-2)^4
=9分之1×(-8分之27)×16
=-8分之3×16
=-6