Tính nhanh B=1212/1515 + 1212/3535 +1212/6363 +1212/9999

0 bình luận về “Tính nhanh B=1212/1515 + 1212/3535 +1212/6363 +1212/9999”

1. `B= 1212/1515 + 1212/3535 + 1212/6363 + 1212/9999`

   `B= (12.101)/(15.101) + (12.101)/(35.101) + (12.101)/(63.101) + (12.101)/(99.101)`

   `B= 12/15 + 12/35 + 12/63 + 12/99`

   `B= 4/5 + 12/35 + 4/21 + 4/33`

   `B= 28/35 + 12/35 + 4/21 + 4/33`

   `B= 8/7 + 4/21 + 4/33`

   `B= 24/21 + 4/21 + 4/33`

   `B= 28/21 + 4/33`

   `B= 4/3 + 4/33`

   `B= 44/33 + 4/33`

   `B= 16/11`

   Vậy `B = 16/11`

   Bình luận

2. Đáp án:

   `B=16/11`

   Giải thích các bước giải:

    `B=1212/1515 + 1212/3535 + 1212/6363 + 1212/9999`

   `B=4/5 + 12/35 + 4/21 + 4/33`

   `B=28/35 + 12/35 + 4/21 + 4/33`

   `B= 40/35 + 4/21 +4/33 `

   `B=8/7 + 4/21 + 4/33`

   `B=24/21 + 4/21 + 4/33`

   `B=28/21 + 4/33`

   `B=4/3 + 4/33`

   `B=44/33 + 4/33`

   `B= 48/33`

   `B=16/11`

   Vậy `B=16/11`

   Bình luận