`bb\color{Red}\text{Giải:}`

`bb{a.}` `3 1/10-3/8`

`=31/10-3/8`

`=248/80-30/80`

`=218/80`

`=109/40`

`@`Có `3>0` và `-11/40<0`

`=>3> -11/40` hay `3>1/10-3/8`

`bb{b.}` `(7-1/2-3/4)/(5-1/4-5/8)`

`=((7*4)/(1*4)-(1*2)/(2*2)-(3)/4)/((5*8)/(1*8)-(1*2)/(4*2)-5/8)`

`=((28)/(4)-(2)/(4)-(3)/4)/((40)/(8)-(2)/(9)-5/8)`

`=((28-2-3)/4)/((40-2-5)/(8))`

`=((23)/4)/((33)/(8))`

`=(23)/4:(33)/(8)`

`=(23)/4*(8)/(33)`

`=(23*8)/(4*33)`

`=(184)/(132)`

`=46/33`

`bb{c.}` `2*5-(-6/9)`

`=2*5+6/9`

`=10+6/9`

`=10+2/3`

`(10*3)/(1*3)+2/3`

`30/3+2/3`

`=32/3`

`bb{d.}` `-3/7+17/26-(2/13-3/7)`

`=-3/7+17/26-2/13+3/7`

`=17/26-2/13`

`=17/26-(2*2)/(13*2)`

`=17/26-(4)/(26)`

`=(17-4)/26`

`=13/26`

`=1/2`