(-3xy)²(x²+xy-y²)-3x²y²(3x²+3xy+y²) 其中x=-4/3,y=-3/2

(-3xy)²(x²+xy-y²)-3x²y²(3x²+3xy+y²) 其中x=-4/3,y=-3/2
(-3xy)²(x²+xy-y²)-3x²y²(3x²+3xy+y²) 其中x=-4/3,y=-3/2

(-3xy)²(x²+xy-y²)-3x²y²(3x²+3xy+y²) 其中x=-4/3,y=-3/2
(-3xy)²(x²+xy-y²)-3x²y²(3x²+3xy+y²)
=9x²y²(x²+xy-y²)-3x²y²(3x²+3xy+y²) 提取 3x²y²
=3x²y²[3(x²+xy-y²)-(3x²+3xy+y²)]
=3x²y²(3x²+3xy-3y²-3x²-3xy-y²)
=3x²y²(-4y²)
=-12x²y^4
将 x=-4/3,y=-3/2 代入得
=-12×(-4/3)²×(-3/2)^4
=-12×16/9×81/16
=-12×9
=-108
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