$\text{Đáp án+Giải thích các bước giải:}$
$3\dfrac{1}{4}$ + $2\dfrac{2}{3}$ + $7\dfrac{3}{4}$ - $1\dfrac{1}{3}$ - $2\dfrac{1}{3}$
= ($3\dfrac{1}{4}$+$7\dfrac{3}{4}$)+($2\dfrac{2}{3}$-$1\dfrac{1}{3}$ - $2\dfrac{1}{3}$ )
$= (3+7+$ $\dfrac{1}{4}$+$\dfrac{3}{4}$)$+(2-1-2+$ $\dfrac{2}{3}$-$\dfrac{1}{3}$-$\dfrac{1}{3}$)
$= 11-1=10$