化简求值(a-1分之a方-1)+(a方-a分之a-1),其中a=(2+根号3)分之1
问题描述:
化简求值(a-1分之a方-1)+(a方-a分之a-1),其中a=(2+根号3)分之1
答
(a方-1)/(a-1)+(a-1)/(a方-a)
=a+1+1/a
=a+1/a+1
=2+根号3+1/(2+根号3)+1
=2+根号3+2-根号3+1
=5=2+根号3+2-根号3+1这一步不对吧1/(2+根号3)分子分母乘以(2-√3)1/(2+根号3)=2-√3��˵һ�¾����̺���1/(2+根号3)=(2-√3)/【(2-√3)(2+根号3)】=(2-√3)/(4-3)=2-√3