giúp cau c và d với aaaaaaaa

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giúp cau c và d với aaaaaaaa

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    `@` Đáp án `:`

    `c.` `(-7)/5 – 5/12`

    `= (-84)/60 – 25/60`

    `= (-84)/60 + (-25)/60`

    `= ((-84) + (-25))/60`

    `= (-109)/60`

    `d.` `(-1)/2 – 3/12 + 9/8`

    `= (-12)/24 – 6/24 + 27/24`

    `= (-12)/24 + (-6)/24 + 27/24`

    `= ((-12) + (-6) + 27)/24`

    `= 9/24 = 3/8`

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