a)1 + 4 + 5 + 9 + 14 + … + 60 + 97 b)78 . 31 + 78 . 24 + 78 . 17 + 22.72

Question

a)1 + 4 + 5 + 9 + 14 + … + 60 + 97
b)78 . 31 + 78 . 24 + 78 . 17 + 22.72

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Gerda 9 months 2020-11-01T07:26:54+00:00 2 Answers 53 views 0

Answers ( )

    0
    2020-11-01T07:28:09+00:00

    Giải thích các bước giải:

    `a)1 + 4 + 5 + 9 + 14 + … + 60 + 97`

    `= 1 + 4 + 5 + 9 + 14 + 23 + 37 + 60 + 97`

    `= 5 + 5 + 23 + 23 + 97 + 97`

    `= 2 (5 + 23 + 97)`

    `= 2.125`

    `= 250`

    `b)78 . 31 + 78 . 24 + 78 . 17 + 22.72`

    `=78.(31+24+17)+22.72`

    `=78.72+22.72`

    `=(78+22).72`

    `=100.72`

    `=7200`

    0
    2020-11-01T07:28:26+00:00

    `a)1 + 4 + 5 + 9 + 14 + … + 60 + 97`

    `= 1+4+5+9+14+23+37+60+97`

    `=(1+4)+5+(9+14)+23+(37+60)+97`

    `=5+5+23+23+97+97`

    `=2.(5+23+97)`

    `=2.125`

    `=250`

    .

    `b)78 . 31 + 78 . 24 + 78 . 17 + 22.72`

    `=78.(31+24+17)+22.72`

    `=78.72+22.72`

    `=72.(78+22)`

    `=72.100`

    `=7200`

    .

    _Kim Rabit Lunar_

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