若x-y=5,-xy=3,求(7x+4y+xy)-6(6分之5y+x-xy)的值
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若x-y=5,-xy=3,求(7x+4y+xy)-6(6分之5y+x-xy)的值
若x-y=5,-xy=3,求(7x+4y+xy)-6(6分之5y+x-xy)的值
若x-y=5,-xy=3,求(7x+4y+xy)-6(6分之5y+x-xy)的值
(7x+4y+xy)-6(6分之5y+x-xy)
=7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5+7*(-3)
=5-21
=-16
负十六
(7x+4y+xy)-6(6分之5y+x-xy)
=7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5-7*(3)
=-16
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