若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值
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若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值若x=y=6,xy=2,求2x+3y-3
若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值
若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值
若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)的值
2x+3y-3xy+(4xy-3x)-(4y-7)
=2x+3y-3xy+4xy-3x-4y+7
=-x-y+xy+7
=-6-6+2+7
=-3
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