若有理数a,b满足|3a+1|+(2b-1)²=0.求3a²-2b³/ab

Question

若有理数a,b满足|3a+1|+(2b-1)²=0.求3a²-2b³/ab

Answer 1

|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