a)25% x m + 3/4 x m=30 b)m=2017 – 2016 + 2015 – 2014 + 2013 – 2012 + 2011 – 2010

Bởi

a)25% x m + 3/4 x m=30
b)m=2017 – 2016 + 2015 – 2014 + 2013 – 2012 + 2011 – 2010

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  1. Đáp án:

    a.

    `25% × m + 3/4 × m = 30`

    `1/4 × m + 3/4 × m = 30`

    `(1/4 + 3/4) × m = 30`

    `1 × m = 30`

    `m = 30 : 1`

    `m = 30`

    Vậy `m = 30`

    b.

    `m = 2017 – 2016 + 2015 – 2014 + 2013 – 2012 + 2011 – 2010`

    `m = (2017 – 2016) + (2015 – 2014) + (2013 – 2012) + (2011 – 2010)`

    `m = 1 + 1 + 1 + 1`

    `m = 4`

    Vậy `m = 4`

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