x+y=3.5,xy=-3/2,求4x+3xy+4y的值...

问题描述:

x+y=3.5,xy=-3/2,求4x+3xy+4y的值...

4x+3xy+4y
=4(x+y)+3*xy
=4*3.5+3*(-3/2)
=14-4.5
=9.5