发布网友 发布时间:2022-04-27 00:49
共3个回答
热心网友 时间:2022-05-02 07:33
n×2的n次方 -(n-1)×2的n次方热心网友 时间:2022-05-02 08:51
(a^2+b^2- a^(-2) -b^(-2))/(a^2b^2- a^(-2)b^(-2)) +(a- a^(-1))(b-b^(-1))/(ab+a^(-1)b^(-1)) =(a^4b^2+a^2b^4- b^2 -a^2)/(a^4b^4-1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =[a^2b^2(a^2+b^2)-(a^2+b^2)]/(a^2b^2+1)(a^2b^2-1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =(a^2b^2-1)(a^2+b^2)/(a^2b^2+1)(a^2b^2-1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =(a^2+b^2)/(a^2b^2+1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =[(a^2+b^2)+(a^2- 1)(b^2-1)]/(a^2b^2+1) =(a^2+b^2+a^2b^2-a^2-b^2+1)/(a^2b^2+1) =(a^2b^2+1)/(a^2b^2+1) =1追问你写的是什么啊
热心网友 时间:2022-05-02 10:26
(a^2+b^2- a^(-2) -b^(-2))/(a^2b^2- a^(-2)b^(-2)) +(a- a^(-1))(b-b^(-1))/(ab+a^(-1)b^(-1)) =(a^4b^2+a^2b^4- b^2 -a^2)/(a^4b^4-1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =[a^2b^2(a^2+b^2)-(a^2+b^2)]/(a^2b^2+1)(a^2b^2-1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =(a^2b^2-1)(a^2+b^2)/(a^2b^2+1)(a^2b^2-1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =(a^2+b^2)/(a^2b^2+1) +(a^2- 1)(b^2-1)/(a^2b^2+1) =[(a^2+b^2)+(a^2- 1)(b^2-1)]/(a^2b^2+1) =(a^2+b^2+a^2b^2-a^2-b^2+1)/(a^2b^2+1) =(a^2b^2+1)/(a^2b^2+1) =1