((3/2x方+xy-3/5y方)*(-4/3x方y方)

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((3/2x方+xy-3/5y方)*(-4/3x方y方)((3/2x方+xy-3/5y方)*(-4/3x方y方)((3/2x方+xy-3/5y方)*(-4/3x方y方)((3/2x方+xy-3/5y方

((3/2x方+xy-3/5y方)*(-4/3x方y方)
((3/2x方+xy-3/5y方)*(-4/3x方y方)

((3/2x方+xy-3/5y方)*(-4/3x方y方)
((3/2x方+xy-3/5y方)*(-4/3x方y方)
=(3/2x方*(-4/3x方y方)+xy*(-4/3x方y方)-3/5y方*(-4/3x方y方)
=-2x的4次方y方-4/3x立方y立方+4/5x方y的4次方