已知a=2+根号3,b=2-根号3求(a+1/b)(b+1/a)

问题描述:

已知a=2+根号3,b=2-根号3求(a+1/b)(b+1/a)

a+b=4,ab=2-3=1
(a+1/b)(b+1/a)
=(ab+1)(ab+1)/ab
=(1+1)(1+1)/1
=4