若x-y=5,-xy=3,求（7x+4y+xy)-6(5/6y+x-xy)的值

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若x-y=5,-xy=3,求（7x+4y+xy)-6(5/6y+x-xy)的值若x-y=5,-xy=3,求（7x+4y+xy)-6(5/6y+x-xy)的值若x-y=5,-xy=3,求（7x+4y+x

若x-y=5,-xy=3,求（7x+4y+xy)-6(5/6y+x-xy)的值
若x-y=5,-xy=3,求（7x+4y+xy)-6(5/6y+x-xy)的值

若x-y=5,-xy=3,求（7x+4y+xy)-6(5/6y+x-xy)的值
（7x+4y+xy)-6(5/6y+x-xy)
＝7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5-3x7
=5-21
=-16

（7x+4y+xy)-6(5/6y+x-xy)=7x+4y+xy-5y-6x+6xy=x-y+7xy=5+7*(-3)=-16

（7x+4y+xy)-6(5/6y+x-xy)
=7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5-21
=-16

=7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5-7*3
=-16

=x-y=7xy
=5+7*(-3)
=-16

原式=7x+4y+xy-5y-6x+6xy=5+7(-3)=-16

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