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Đáp án + Giải thích các bước giải:

`a.`

`0,75 - 5/6 + 1 1/2`

`= 3/4 - 5/6 + 3/2`

`= 9/12 - 10/12 + 18/12`

`= 17/12`

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`b.`

`3/7 + 4/15 + (-8/21) + (-0,4)`

`= 3/7 + 4/15 - 8/21 - 2/5`

`= (3/7 - 8/21) + (4/15 - 2/5)`

`= (9/21 - 8/21) + (4/15 - 6/15)`

`= 1/21 - 2/15`

`= -3/35`

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`c.`

`0,625 + (-2/7) + 3/8 + (-5/7) + 1 2/3`

`= 5/8 - 2/7 + 3/8 - 5/7 + 5/3`

`= (5/8 + 3/8) + (-2/7 - 5/7) + 5/3`

`= 1 + (-1) + 5/3`

`= 5/3`

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`đ.`

`(-3) . (-38/21) . (-7/6) . (-3/19)`

`= -38/21 . (-3/19) . (-3) . (-7/6)`

`= 2/7 . 7/2`

`= 1`

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`e.`

`(11/18 : 22/9) . 8/5`

`= (11/18 . 9/22) . 8/5`

`= 1/4 . 8/5`

`= 2/5`

____________________________

`g.`

`[(-4/5) . 5/8] . (-25/12)`

`= -1/2 . (-12/25)`

`= 6/25`