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Đáp án:

Giải thích các bước giải:

 `a)` `31/23-(7/32+8/23)`

`=31/23-7/32-8/23`

`=(31/23-8/23)-7/32`

`=1-7/32`

`=25/32`

`b)` `(1/3+12/67+13/41)-(79/67-28/41)`

`=1/3+12/67+13/41-79/67+28/41`

`=(12/67-79/67)+(13/41+28/41)+1/3`

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

`=0+1/3`

`=1/3`

`c)` `38/45-(8/45-17/51-3/11)`

`=38/45-8/45+1/3-3/11`

`=2/3+1/3-3/11`

`=1-3/11`

`=8/11`