( 1/2 -1/3-1/6)× (1/2+2/3+3/4+…. 2017/2018)+3/4: x = 9/10

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1. Xin lỗi bạn vì mình gửi bài muộn ,mình đag pk trả lời câu khác

   `( 1/2 -1/3-1/6). (1/2+2/3+3/4+…. 2017/2018)+3/4: x = 9/10`
   `(3/6-2/6-1/6).(1/2+2/3+3/4+…. 2017/2018)+3/4:x=9/10`
   `([3-2-1]/6)(1/2+2/3+3/4+…. 2017/2018)+3/4:x=9/10`
   `0.(1/2+2/3+3/4+…. 2017/2018)+3/4:x=9/10`
   `0+3/4:x=9/10`
   `3/4:x+9/10`
   `x=3/4:9/10`
   `x=3/4. 10/9`
   `x=5/6`
   Vậy `x=5/6`

   $#Rabifoot$

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2. `(1/2 – 1/3 – 1/6) xx (1/2 + 2/3 + 3/4 + … + 2017/2018) + 3/4 : x = 9/10`

   Ta có: `1/2 – 1/3 – 1/6 = 3/6 – 2/6 – 1/6 = 0/6 = 0`

   `=> 0 xx (1/2 + 2/3 + … + 2017/2018) + 3/4 : x = 9/10`

   `=> 0 + 3/4 : x = 9/10`

   `=> 3/4 : x = 9/10`

   `=> x = 3/4 : 9/10`

   `=> x = 5/6`

   `Vậy  x = 5/6`

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