已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,重在
已知x+y=3,xy=-2,求(3x-4y+2xy)-(2x-5+5xy)的值,
人气:374 ℃ 时间:2020-02-03 07:32:41
解答
(3x-4y+2xy)-(2x-5y+5xy)
=x+y-3xy
=3+3x2
=9
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