(1/a+b)-(1/a-b)=? @□@; p~l~ea~~se~~

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 20:26:44
(1/a+b)-(1/a-b)=? @□@; p~l~ea~~se~~
xPAN0JTR+؎ہT_T-Nh!q+n<.SDN;3;;ڤMR'04=O/3n7QmۘM`9Y2A&nvih:/}I‘ЇUxC+uej7;OzbA]{F5M:*ontT)B(:TMwAVmCQjUbL/9BbrK5Da.2&(*bSi.f4"fJ2iJ#r\6E]E[ ,fDcI)}?(

(1/a+b)-(1/a-b)=? @□@; p~l~ea~~se~~
(1/a+b)-(1/a-b)=? @□@; p~l~ea~~se~~

(1/a+b)-(1/a-b)=? @□@; p~l~ea~~se~~
答:
1/(a+b)-1/(a-b)
=(a-b)/[(a+b)(a-b)]-(a+b)/[(a+b)(a-b)]
=[(a-b)-(a+b)]/(a^2-b^2)
=-2b/(a^2-b^2)
=2b/(b^2-a^2)