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 01/07/2021 Bởi Natalia 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 . (-9)/23 : 1/5` `= 230 . (-9)/23` `= -90` `b,` `-34 . (1/17 – 5/34 + 1/2) : 4` `= -34 . (2/34 – 5/34 + 17/34) : 4` `= -34 . 7/17 : 4` `= -14 : 4` `= -3,5` Bình luận
`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` ——————————————————————————– `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` Bình luận
`a,`
`46 . (1/2 – 7/23 – 27/46) : 1/5`
`= 46 . (23/46 – 14/46 – 27/46) : 1/5`
`= 46 . (-9)/23 : 1/5`
`= 230 . (-9)/23`
`= -90`
`b,`
`-34 . (1/17 – 5/34 + 1/2) : 4`
`= -34 . (2/34 – 5/34 + 17/34) : 4`
`= -34 . 7/17 : 4`
`= -14 : 4`
`= -3,5`
`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`
——————————————————————————–
`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`