若x、y都是实数,且|2x-3|与根号y+5互为相反数,求:立方根2x+y的值.
人气：454 ℃ 时间：2019-08-22 00:19:34
解答
∵|2x-3|与根号y+5应该都是非负的,且它们互为相反数,
∴|2x-3|+根号y+5=0,
∴2x-3=0,y+5=0.
即2x=3,y=-5.
故2x+y=3-5=-2,
∴三次根号下2x+y=-三次根号2.
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