`\color{#1AD5F7}{⋆⟡}\color{#1AD5F7}{A}\color{#4DA6E6}{l}\color{#668EDD}{i}\color{#8077D5}{e}\color{#995FCD}{0}\color{#CC2FBC}{2}\color{#EA2F90}{⟡⋆}`

`a.``11/18+(7/6-2/3)+5/9`

`=11/18+(7/6-4/6)+5/9`

`=11/18+1/2+5/9`

`=11/18+9/18+10/18`

`=20/18=10/9`

`b.``11/10-(4/15+1/3-2/5)`

`=11/10-(4/15+5/15-6/15`

`=11/10-1/5`

`=11/10-2/10`

`=9/10`