TÍNH HỢP LÝ nha

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`e)``5/15+(-23)/15-(-2)/3+18/5-1/83`

`=1/3-23/15+2/3+18/5-1/83`

`=(1/3+2/3)-(23/15-18/5)-1/83`

`=3/3-5/5-1/83`

`=1-1-1/83`

`=0-1/83`

`=(-1)/83`

`h)``5/7. 5/11+5/11. 2/7-5/7. 14/11`

`=5/7. 5/11+5/11. 2/7-5/11. 14/7`

`=5/11.(5/7+2/7-14/7)`

`=5/11. (-7)/7`

`=5/11.(-1)`

`=(-5)/11`

`k)``7/4. 29/5-7/5. 9/4-7/4`

`=7/4. 29/5-7/4. 9/5-7/4. 1`

`=7/4.(29/5-9/5-1)`

`=7/4. 15/5`

`=7/4. 3`

`=21/4`

`l)``13/9. 4/3-40/3. 4/9+4/9`

`=4/9. 13/3-4/9. 40/3+4/9. 1`

`=4/9.(13/3-40/3+1)`

`=4/9.(-24)/3`

`=4/9.(-8)`

`=(-32)/9`