Đáp án:

 

Giải thích các bước giải:

 `-5/11 +9 -6/11 +1`

`=-(5/11 +6/11) +10`

`=-1 +10`

`=9`

``

`2/3 + 95/7 + (-2)/3`

`=(2/3 -2/3)+95/7`

`=95/7`

``

`(-1/4 + 5/8) + (-3)/8`

`=-1/5 +5/8 - 3/8`

`=-1/5 + 1/4`

`=1/20`

``

`3/4 * 725 + 3/4 * 18/25`

`=3/4 * (7/25 + 18/25)`

`=3/4 *1`

`=3/4`

``

`7/5 * 8/19 + 7/5 * 12/9 -7/5 *1/9`

`=7/5 (8/19 +12/9 -1/9)`

`=7/5 (8/19 - 11/9)`

`=7/5 * (-137)/171`

`=-238/855`

``

`-3/5 * 5/7 + (-3)/5 * 3/7 + (-3)/5 * 6/7`

`=-3/5 * (5/7 + 3/7 + 6/7)`

`=-3/5 *2`

`=-6/5`

``

`10 2/9 + (2 2/5 - 7 2/9)`

`=10 2/9 +2 2/5 - 7 2/9`

`=(10 2/9 -7 2/9) +2 +2/5`

`=3 +2+2/5`

`=5 +2/5`

`=27/5`

``

`6 3/10 -(3 4/7 +2 3/10)`

`=6 3/10 -3 4/7 - 2 3/10`

`=(6 3/10 -2 3/10) -3 -4/7`

`=4 -3-4/7`

`=1-4/7`

`=3/7`

``

`(7 4/9 +4 7/11) -3 4/9`

`=7 4/9 +4 7/11 -3 4/9`

`=(7 4/9 - 3 4/9) +4 +7/11`

`=4 +4 +7/11`

`=8 +7/11`

`=95/11`