`12/5`:`16/15` `9/8`:`6/5` `3/5`:(`-1/15`-`1/6`)+`3/5`;(`-1/3`-1`1/15`) (`-3/4`+`5/13`):`2/3`-(2`1/4`-`8/13`):`2/7`

0 bình luận về “`12/5`:`16/15` `9/8`:`6/5` `3/5`:(`-1/15`-`1/6`)+`3/5`;(`-1/3`-1`1/15`) (`-3/4`+`5/13`):`2/3`-(2`1/4`-`8/13`):`2/7`”

1. Đáp án + Giải thích các bước giải:

   +) `12/5 : 16/15 = 12/5 . 15/16 = 9/4`

   +) `9/8 : 6/5 = 9/8 . 5/6 = 15/16`

   +) `3/5 : (-1/15-1/6) + 3/5 : (-1/3-1 1/15)`

   `= 3/5 : (-7)/30 + 3/5 : (-7)/5`

   `= 3/5 . (-30)/7 + 3/5 . (-5)/7`

   `= 3/5 . ((-30)/7 + (-5)/7)`

   `= 3/5 . (-5) = -3`

   +) `(-3/4+5/13):2/3-(2 1/3-8/13):2/7`

   `=(-19)/52 . 3/2 – 85/52 . 7/2`

   `= (-57)/104 – 595/104`

   `= -652/104 = -163/26`

   Trả lời

2. *Lời giải :

   12/5 : 16/15

   = 12/5 . 15/16

   = 9/4

   9/8 : 6/5

   = 9/8 . 5/6

   = 15/16

   3/5 : (-1/15 – 1/6) + 3/5 : (-1/3 – 1 1/15)

   = 3/5 : -7/30 + 3/5 : (-1/3 – 16/15)

   = 3/5 . -30/7 + 3/5 . -5/7

   = 3/5 . (-30/7 + -5/7)

   = 3/5 . -5

   = -3

   (-3/4 + 5/13) : 2/3 – (2 1/4 – 8/13) : 2/7

   = -19/52 . 3/2 – (9/4 – 8/13) . 7/2

   = -57/104 – 85/52 . 7/2

   = -57/104 – 595/104

   = -163/26

   Trả lời