作业帮已知x+y=3,xy=-2求,【3x-5y+4xy]-[6x-2y+6xy]的值
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已知x+y=3,xy=-2求,【3x-5y+4xy]-[6x-2y+6xy]的值
已知x+y=3,xy=-2求,【3x-5y+4xy]-[6x-2y+6xy]的值
已知x+y=3,xy=-2求,【3x-5y+4xy]-[6x-2y+6xy]的值
【3x-5y+4xy]-[6x-2y+6xy]=3x-5y+4xy-6x+2y-6xy=-3x-3y-2xy=-3(x+y)-2xy
x+y=3,xy=-2代入后得：
-3(x+y)-2xy=-9+4=-5
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