已知x+y=3又2分之1,xy=-3分之2,求4x+3xy+4y的值(要过程)
人气:488 ℃ 时间:2019-08-19 22:31:44
解答
4x+3xy+4y
=4x+4y+3xy
=4(x+y)+3*(xy)
=4*(3+1/2)+3*(-2/3)
=14-2
=12
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