Tính

0 bình luận về “Tính”

1. `E=3^2/(8.11)+3^2/(11.14)+…+3^2/(197.200)`

   `⇔E=3(3/(8.11)+3/(11.14)+…+3/(197.200))`

   `⇔E=3(1/8-1/11+1/11-1/14+..+1/197-1/200)`

   `⇔E=3(1/8-1/200)`

   `⇔E=3 . 3/25`

   `⇔E=9/25`

    

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2. = `3` `.“(“3/8.11` `+` `3/11.14` `+` … + `3/197.200“)`

   = `3` `.` `(“1/8` `-` `1/200“)`

   = `3` `.` `24/200`

   = `9/25`

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