Đáp án + Giải thích các bước giải:

 `b)` `(-5/17) . 31/33+(-5/7). 2/33+2` `5/17`

`=(-5/17).(31/33+2/33)+39/17`

`=(-5/17).` `1+39/17`

`=2`

`c)` `1/2` `.` $\sqrt{64}$ `-` $\sqrt{4/25}$ + 1⁰

`=1/2` `.` `8-2/5+1`

`=4-2/5+1`

`=18/5+1`

`=23/5`

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