làm hộ e với ạ;-; cần gấp hhu

Bài `1`

`a)`

`6/8+4/2-2/10`

`=3/4+2-1/5`

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

`=11/4-1/5`

`=55/20-4/20`

`=51/20`

`b)`

`-6/12+11/22+4/6+(-6)/12+10/22`

`=(-6/12+4/6+(-6)/12)+(11/22+10/22)`

`=(-6/12+8/12-6/12)+21/22`

`=-4/12+21/22`

`=-1/3+21/22`

`=41/66`

`d)`

`5·1/3+5·2/9+5·5/21`

`=5(1/3+2/9+5/21)`

`=5·50/63`

`=250/63`

Bài `2`

`a)`

`x+3/4=-8/2`

`x+3/4=-4`

`x=-4-3/4`

`x=-19/4`

Vậy `x=-19/4`

`b)`

`(x+12)/4=13/2`

`2(x+12)=13·4`

`2x+24=52`

`2x=28`

`x=14`

Vậy `x=14`