a)($\frac{1}{4}$+$\frac{-5}{13}$)+($\frac{991}{997}$+$\frac{-8}{13}$+$\frac{3}{4}$) b)$\frac{-1}{7}$.(9$\frac{1}{2}$-8,75):$\frac{2}{7}$+0,625:1$\frac

Bởi

a)($\frac{1}{4}$+$\frac{-5}{13}$)+($\frac{991}{997}$+$\frac{-8}{13}$+$\frac{3}{4}$)
b)$\frac{-1}{7}$.(9$\frac{1}{2}$-8,75):$\frac{2}{7}$+0,625:1$\frac{2}{3}$

0 bình luận về “a)($\frac{1}{4}$+$\frac{-5}{13}$)+($\frac{991}{997}$+$\frac{-8}{13}$+$\frac{3}{4}$) b)$\frac{-1}{7}$.(9$\frac{1}{2}$-8,75):$\frac{2}{7}$+0,625:1$\frac”

  1. Đáp án:

     a) (1/4 + -5/13) + (991/997 + -8/13 + 3/4)

      = 1/4 – 5/13 + 991/997 – 8/13 + 3/4

      = (1/4 + 3/4) + (-5/13 – 8/13) + 991/997

      = 1 – 1 + 991/997

      = 991/997

     b) -1/7 . ( 9  1/2 – 8,75) : 2/7 +0,625 : 1  2/3

      = -1/7 . (19/2 – 35/4 ) . 7/2 + 5/8 . 3/5

      = -1/7 . 3/4 . 7/2 + 3/8

      = -3/28 . 7/2 + 3/8

      = -3/8 + 3/8 = 0

     Hok tốt!

     Xin câu trả lời hay nhất!

     #Tamthatthat

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  2. a) (`1/4`  + `-5/13`) + ( `991/997`+ `-8/13`+ `3/4`)

    = `1/4` + `-5/13` +  `991/997`+ `-8/13`+ `3/4`

    = ( `1/4` + `3/4`) + ( `-5/13+ `-8/13`) + `991/997`

    = `4/4` + `-13/13` + `991/997`

    = 1 + (-1) + `991/997`

    = 0 + `991/997`

    = `991/997`

    b)

    b) `-1/7` . ( 9  `1/2` – 8,75) : `2/7` +0,625 : 1  `2/3`

      =` -1/7` . (`19/2 `- `35/4` ) .` 7/2` + `5/8` . `3/5`

      = `-1/7` . `3/4` . `7/2` + `3/8`

      = `-3/28 `. `7/2` + `3/8`

      = `-3/8` + `3/8` = 0

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