若有理数a,b满足|3a+1|+(2b-1)²=0.求3a²-2b³/ab
问题描述:
若有理数a,b满足|3a+1|+(2b-1)²=0.求3a²-2b³/ab
答
|3a+1|>=0,(2b-1)²>=0
所以:3a+1=0,2b-1=0
a=-1/3,b=1/2
(3a^2-2b^3)/ab
=7/2