x+y=3.5,xy=-3/2,求4x+3xy+4y的值...
人气：140 ℃ 时间：2019-12-01 14:38:18
解答
4x+3xy+4y
=4(x+y)+3*xy
=4*3.5+3*(-3/2)
=14-4.5
=9.5
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