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