M=3/2-5/6+7/12-9/20+11/30-13/42+12/56-17/72

0 bình luận về “M=3/2-5/6+7/12-9/20+11/30-13/42+12/56-17/72”

1. Đáp án:

   `B = 3/2 – 5/6 + 7/12 – 9/20 + 11/30 – 13/42 + 15/56 -17/72`

   `B = 3/(1.2) –  5/(2.3) + 7/(3.4) – 9/(4 . 5) + 11/(5.6) – 13/(6.7) + 15/(7.8) – 17/(8.9)`

   `B = 3 – 3/2 -5/2 -(- 5/3) + 7/3 – 7/4 – 9/4 -(- 9/5) + 11/5 – 11/6 – 13/6 -(- 13/7) + 15/7 – 15/8-17/8 -(-17/9)`

   `B = 3 – 3/2 -5/2 + 5/3 + 7/3 – 7/4 – 9/4 + 9/5 + 11/5 – 11/6 – 13/6 + 13/7 + 15/7 – 15/8 – 17/8+17/9`

   `B = 3 + (-3/2 – 5/2) + (5/3 + 7/3) + (-7/4 – 9/4) + (9/5 + 11/5) + (-11/6 – 13/6) +( 13/7  + 15/7) +(- 15/8-17/8) + 17/9`

   `B = 3 + (-4) + 4 + (-4) + 4 + (-4) + 4 + (-4) + 17/9`

   `B = 3 + [(-4) + 4] +[ (-4) + 4] +[ (-4) + 4] + (-4) + 17/9`

   `B = 3 + 0 + 0 + 0 + (-4) + 17/9`

   `B = 3  – 4 + 17/9`

   `B = -1 + 17/9`

   `B = -9/9 + 17/9`

   `B = 8/9`

    

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