(2) $3 \frac{3}{4} \div 5=$

Step 1 ：Convert the mixed number $3 \frac{3}{4}$ to an improper fraction: $\frac{3 \times 4 + 3}{4} = \frac{15}{4}$

Step 2 ：Divide the improper fraction by 5: $\frac{15}{4} \div 5 = \frac{15}{4} \times \frac{1}{5}$

Step 3 ：Multiply the fractions: $\frac{15 \times 1}{4 \times 5} = \frac{15}{20}$

Step 4 ：Simplify the fraction: $\frac{15}{20} = \frac{3 \times 5}{4 \times 5} = \frac{3}{4}$

Step 5 ：\(\boxed{\frac{3}{4}}\)