a) 1/5 – 9/10 + -10/25 b) 1/4 – 7/8 + -9/10 c) 5/4 – 1/2 + -7/8 d) -5/8 – 1/3 + -7/6 e) -3/4 – 7/10 + -5/6

a) 1/5 – 9/10 + -10/25
b) 1/4 – 7/8 + -9/10
c) 5/4 – 1/2 + -7/8
d) -5/8 – 1/3 + -7/6
e) -3/4 – 7/10 + -5/6

0 bình luận về “a) 1/5 – 9/10 + -10/25 b) 1/4 – 7/8 + -9/10 c) 5/4 – 1/2 + -7/8 d) -5/8 – 1/3 + -7/6 e) -3/4 – 7/10 + -5/6”

  1. Đáp án:

    a) `1/5 – 9/10 + (-10/25)`

    `=1/5 -9/10 – 2/5`

    `=2/10 – 9/10 -4/10 `

    `= -11/10`

    b) `1/4 – 7/8 + -9/10`

    `=1/4 – 7/8  -9/10`

    `=10/40 – 35/40 -36/40`

    `=-61/40`

    c) `5/4 – 1/2  -7/8`

    `=10/8 – 4/8 -7/8`

    `= -1/8`

    d) `-5/8 – 1/3  -7/6`

    `=-20 /24 – 8/24  –  28/24`

    `=  (-56)/24`

    e) `-3/4 – 7/10 -5/6`

    `= -45/60 – 42/60 – 50/60`

    `=-137/60`

    mong ctlhn 

     

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  2. Đáp án:

     ——-

    Giải thích các bước giải:

     a) `1/5` – `9/10` + `-10/25`

    =`(2-9-4)/10` 

    =`-11/10`

     b) `1/4` – `7/8` + `-9/10`

    =`(2-7)/8` + `-9/10`

    =`-5/8` + `-9/10`

    =`(-25 – 36) / 40`

    =`-61/40`

     c)`5/4` – `1/2` + `-7/8`

    =`10/8` – `4/8` + `-7/8`

    =`(10 – 4 – 7)/8`

    =`-1/8`

     d)`-5/8` – `1/3` +`7/6`

    = `-15/24` – `8/24` + `28/24`

    =`(-15 – 8 + 28)/24`

    =`5/24`

     e)`-3/4` – `7/10` + `-5/6`

    =`-90/120` – `84/120` + `-100/120`

    =`(-90 – 84 – 100 )/120`

    =`-274/120`

    =`-137/60`

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