a) (-1/2) + (-1/3) – (-5/4) b) 5/4 – 1/2 + (-7/8) c) 1/5 – 1/2 + 9/10 d) 5/4 – 1/3 + 7/6 e) (-2/5) + (-7/10) – 9/6

0 bình luận về “a) (-1/2) + (-1/3) – (-5/4) b) 5/4 – 1/2 + (-7/8) c) 1/5 – 1/2 + 9/10 d) 5/4 – 1/3 + 7/6 e) (-2/5) + (-7/10) – 9/6”

1. Đáp án + Giải thích các bước giải:

   a) `(-1/2)+(-1/3)-(-5/4)=-1/2-1/3+5/4`

   `=-6/12 – 4/12 + 15/12 = (-6-4+15)/12 = 5/12`

   b) `5/4 – 1/2 + (-7/8) = 5/4 – 1/2 – 7/8`

   `= 10/8 – 4/8 – 7/8 = (10-4-7)/8 = -1/8`

   c) `1/5 – 1/2 + 9/10 `

   `= 2/10 – 5/10 + 9/10 = (2-5+9)/10 = 6/10 = 3/5`

   d) `5/4 – 1/3 + 7/6 `

   `= 15/12 – 4/12 + 14/12 = (15-4+14)/12 = 25/12`

   e) `(-2/5)+(-7/10)-9/6= -2/5 – 7/10 – 9/6`

   `= -12/40 – 21/30 – 45/30 = (-12-21-45)/30 = -78/30 = -13/5`

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2. Đáp án:

   a) `(-1/2) + (-1/3) – (-5/4)`

    `= -1/2 -1/3 + 5/4`

   `=-6/12 – 4/12 + 15/12`

   `= 5/12`

   b) `5/4 – 1/2 + (-7/8)`

   `5/4 – 1/2 -7/8`

   `= 10/8 – 4/8 -7/8`

   `= -1/8`

   c) `1/5 – 1/2 + 9/10`

   `= 2/10 – 5/10 + 9/10`

   `=6/ 10 = 3/5`

   d) `5/4 – 1/3 + 7/6`

   `=15/12 – 4/12 + 14/12`

   `= 25/12`

   e)` (-2/5) + (-7/10) – 9/6`

   `=  -2/5 -7/10 – 9/6`

   `= -12/ 30 -21/30 – 45/30`

   `= -78/30 = -13/5`

   mong ctlhn ạ~~

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