a+b=(3+√7)/2,求a2+(1+√7)ab的值
解析:∵a+b=(3+√7)/2==>b=(3+√7)/2-a
设f(a)= a2+(1+√7)(3+√7)/2a-(1+√7)a2=(1+√7)(3+√7)/2a-√7a2=(5+2√7)a-√7a2 (0
a+b=(3+√7)/2,求a2+(1+√7)ab的值
解析:∵a+b=(3+√7)/2==>b=(3+√7)/2-a
设f(a)= a2+(1+√7)(3+√7)/2a-(1+√7)a2=(1+√7)(3+√7)/2a-√7a2=(5+2√7)a-√7a2 (0