Tính (tính nhanh) : a, 1/2 . 25/3 : -2/15 . 12/24 – 1/3 b, 5/8 + (-5/8 + -3/5) – 4/5 + 1 c, 2 . -13 . 9 . 10/ (-3) . 4 . (-5) . 26 d, (1/3 + 12/67 + 1

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Tính (tính nhanh) :
a, 1/2 . 25/3 : -2/15 . 12/24 – 1/3
b, 5/8 + (-5/8 + -3/5) – 4/5 + 1
c, 2 . -13 . 9 . 10/ (-3) . 4 . (-5) . 26
d, (1/3 + 12/67 + 13/41) – (79/67 – 28/41)

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  1. $a$)  `1/2 . 25/3 : -2/15 . 12/24 – 1/3`

    `= 1/2 . 25/3 . 15/-2 . 1/2 -1/3`

    `= 1/4 . {125}/-2 – 1/3`

    `= {125}/-8 – 1/3`

    `= -383/24`

    $b$) `5/8 + (-5/8 + -3/5) – 4/5 + 1`

    `= 5/8 – 5/8 – 3/5 – 4/5 + 1`

    `= -7/5 + 1`

    `= -2/5`

    $c$) `{2.(-13).9.10}/{-3.4.(-5).26}`

    `= {-1.3.2}/{2.(-1).(-2)}`

    `= {-6}/{4}`

    `= {-3}/2`

    $d$) `(1/3 + 12/67 + 13/41) – (79/67 – 28/41)`

    `= 1/3 + 12/67 + 13/41 – 79/67 + 28/41`

    `= -67/67 + 41/41 + 1/3`

    `= -1 + 1 + 1/3`

    `= 1/3`

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