2 câu trả lời
$\text{$\frac{9}{11}$- $\frac{7}{8}$+ $\frac{13}{11}$- $\frac{1}{8}$ }$
$\text{=($\frac{9}{11}$+ $\frac{13}{11}$) - ($\frac{7}{8}$+ $\frac{1}{8}$)}$
$\text{=$\frac{9+13}{11}$- $\frac{7+1}{8}$ }$
$\text{=$\frac{22}{11}$- $\frac{8}{8}$ }$
$\text{=2-1=1}$