✨ Best Answer ✨
(2)は書き換えると
1/15 + 1/17 -(1/17 + 1/19) + 1/19 +1/21 -(1/21 + 1/23)
= 1/15 - 1/23
= (23-15)/(15×23 )
= 8/ 345
これの(2)ってどうやって解くんですか😭
✨ Best Answer ✨
(2)は書き換えると
1/15 + 1/17 -(1/17 + 1/19) + 1/19 +1/21 -(1/21 + 1/23)
= 1/15 - 1/23
= (23-15)/(15×23 )
= 8/ 345
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ありがとうございます🙇♀️