若x-y=5,-xy=3,求(7x+4y+xy)-6(5/6·y+x-xy)的值
2个回答
(7x+4y+xy)-6(5/6y+x-xy)
=7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5+7×(-3)
=-16
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