已知x+y=-4,xy=3,求5(½ xy+2y)+〔6x-( 2xy+y-3x)〕的值

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已知x+y=-4,xy=3,求5(½ xy+2y)+〔6x-( 2xy+y-3x)〕的值
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已知x+y=-4,xy=3,求5(½ xy+2y)+〔6x-( 2xy+y-3x)〕的值
已知x+y=-4,xy=3,求5(½ xy+2y)+〔6x-( 2xy+y-3x)〕的值

已知x+y=-4,xy=3,求5(½ xy+2y)+〔6x-( 2xy+y-3x)〕的值
5(½ xy+2y)+〔6x-( 2xy+y-3x)〕
=2.5xy＋10y＋6x－2xy－y＋3x
=½xy＋9y＋9x
=½×3＋9×﹙－4﹚
=－34.5

5(½ xy+2y)+〔6x-( 2xy+y-3x)〕
=(5/2xy+10y)+(6x-2xy-y+3x)
=5/2xy+10y+6x-2xy-y+3x
=9x+9y+1/2xy
=9(x+y)+1/2xy
=9×(-4)+1/2×3
=-36+3/2
=-69/2

75/2

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