Giúp mik với .

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Giúp mik với .

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    Đáp án`+`Giải thích các bước giải:

    `a)1/6+2/5`

    `=5/30+12/30`

    `=(5+12)/30`

    `=17/30`

    `b)3/5+(-7)/4`

    `=12/20+(-35)/20`

    `=(12-35)/20`

    `=(-23)/20`

    `c)2+(-5)/8`

    `=(16)/8+(-5)/8`

    `=(16-5)/8`

    `=11/8`

    `d)4/13+(-12)/39`

    `=(4.3)/(13.3)+(-12)/39`

    `=12/39+(-12)/39`

    `=0`

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