tính 15 3/13 – [ 3 4/7 + 8 3/13 ] [ 7 4/9 + 4 7/11 ] – 3 4/9 -7/9 . 4/11 + -7/9 . 7/11 + 5 7/9

0 bình luận về “tính 15 3/13 – [ 3 4/7 + 8 3/13 ] [ 7 4/9 + 4 7/11 ] – 3 4/9 -7/9 . 4/11 + -7/9 . 7/11 + 5 7/9”

1. 15 3/13 – [ 3 4/7 + 8 3/13 ]

   =15 3/13 -25/7- 8 3/13

   =( 15 3/13 – 8 3/13) +25/7

   =7+25/7

   =74/7

   [ 7 4/9 + 4 7/11 ] – 3 4/9

   =7 4/9 + 4 7/11- 3 4/9

   = (7 4/9- 3 4/9)+5/11

   =4+5/11

   =49/11

   -7/9 . 4/11 + -7/9 . 7/11 + 5 7/9

   =-7/9.(4/11+7/11)-57/9

   =-7/9.1-57/9

   =-7/9-57/9

   =-64/9

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2. `15 3/13 – (3 4/7 + 8 3/13 )`

   `= 15 3/13 – 3 4/7 – 8 3/13 `

   `= 15 3/13 – 8 3/13 – 3 4/7`

   `= 7 – 3 4/7`

   `= 3 3/7`

   `(7 4/9 + 4 7/11)- 3 4/9`

   `=  7 4/9 + 4 7/11 – 3 4/9`

   `= 7 4/9 – 3 4/9 + 4 7/11`

   `=4 + 4 7/11`

   `= 8 7/11`

   `-7/9 . 4/11 + -7/9 . 7/11 + 5 7/9`

   `=-7/9(4/11+7/11) + 5  7/9`

   `= -7/9 + 5 7/9`

   `=5`

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