设x+y=5,xy=负3,求代数式(2x减3y减2xy)减(x减4y+xy)的值
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设x+y=5,xy=负3,求代数式(2x减3y减2xy)减(x减4y+xy)的值
设x+y=5,xy=负3,求代数式(2x减3y减2xy)减(x减4y+xy)的值
设x+y=5,xy=负3,求代数式(2x减3y减2xy)减(x减4y+xy)的值
x+y=5
xy=-3
(2x-3y-2xy)-(x-4y+xy)
=2x-3y-2xy-x+4y-xy
=x+y-3xy
=5-3×(-3)
=5+9
=14
(2x减3y减2xy)减(x减4y+xy)
=x+y-3xy
=5-3*(-3)
=14