若x-y=5,-xy=3,求(7x+4x+xy)-6(5/6y+x-xy)
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若x-y=5,-xy=3,求(7x+4x+xy)-6(5/6y+x-xy)
若x-y=5,-xy=3,求(7x+4x+xy)-6(5/6y+x-xy)
若x-y=5,-xy=3,求(7x+4x+xy)-6(5/6y+x-xy)
(7x+4y+xy)-6(5/6y+x-xy)
=7x+4y+xy-5y-6x+6xy
=x-y+7xy
=5+7×(-3)
=-16
11x-3-5y-6x-18=5x-5y-21=4
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求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
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