若有理数A,B满足|3a+1|+(2b-1)的二平方=0,求3a²-2b三次方/ab的值?
问题描述:
若有理数A,B满足|3a+1|+(2b-1)的二平方=0,求3a²-2b三次方/ab的值?
答
因为
|3a+1|>=0,(2b-1)²>=0
|3a+1|+(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