tính bằng cách thuận tiện nhất a/ 46(1/2-7/23-27/46):1/5 b/ -34(1/17-5/34+1/2):4

`a) 46 . ( 1/2 – 7/23 – 27/46) : 1/5`

`= 46 . ( 23/46 – 14/46 – 27/46) : 1/5`

`= (46 . 23/46 – 46 . 14/46 – 46 . 27/46) : 1/5`

=`(\frac{46 . 23}{46}- \frac{46 . 14}{46}- \frac{46.27}{46})“ : 1/5`

`= (23 – 14 – 27) : 1/5`

`= -18 : 1/5`

`= -90`

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`b) -34 ( 1/17 – 5/34 + 1/2) : 4`

`= -34 . ( 2/34 – 5/34 + 17/34) : 4`

`= (-34 . 2/34 – (-34) . 5/34 + (-34) . 17/34) : 4`

=`(\frac{-34 . 2}{34} – \frac{-34 . 5}{34} + \frac{-34 . 17}{34})` `: 4`

`=[-2 + 5 + (-17)] : 4`

`= -14 : 4`

`= -3,5`