giúp e vs ạ C1 A=3và1/4 + 5và3/8 - 1và1/12 B=3và5/6 : 1và1/3 x 3 C2 a) 2và5/7 + 3và11/14 b)3và2/11x1và7/15 c)4và1/3-2và1/9+1và5/18x22

Câu `1`

`A=3 1/4+5 3/8-1 1/12`

`A=13/4+43/8-13/12`

`A=78/24+129/24-26/24`

`A=181/24`$\\$

`B=3 5/6:1 1/3xx3`

`B=23/6:4/3xx3`

`B=23/8xx3`

`B=69/8`$\\$

Câu `2`

`a,2 5/7+3 11/14`

`=19/7+53/14`

`=38/14+53/14`

`=13/2`$\\$

`b,3 2/11xx1 7/15`

`=35/11xx22/15`

`=14/3`$\\$

`c,4 1/3-2 1/9+1 5/18xx22`

`=13/3-19/9+23/18xx22`

`=13/3-19/9+253/9`

`=39/9-19/9+253/9`

`=91/3`