1. 用简便方法计算下面各题。
$\frac{3}{13} × \frac{1}{4} × 39$
$\frac{5}{9} × \frac{3}{8} × \frac{8}{15}$
$\frac{3}{5} × (1 - \frac{1}{4}) × \frac{4}{9}$
$\frac{7}{13} × 3.5 × \frac{26}{35}$
$\frac{3}{8} × \frac{5}{16} × 16 × \frac{39}{25}$
$\frac{12}{37} × (18 × 74) × \frac{5}{18}$

1. $\frac{9}{4}$
2. $\frac{1}{9}$
3. $\frac{1}{5}$
4. $1.4$
5. $\frac{117}{40}$
6. $120$

2. 用简便方法计算下面各题。
$(\frac{6}{11} - \frac{3}{8}) × 88$
$36 × \frac{3}{8} + \frac{5}{8} × 36$
$(\frac{7}{12} + \frac{3}{5}) × 12 × 5$
$72 × (\frac{13}{24} + \frac{3}{8} - \frac{7}{9})$
$\frac{8}{9} × \frac{12}{13} - \frac{8}{9} × \frac{3}{13}$
$12 × (\frac{5}{12} - \frac{5}{16}) × 16$
$\frac{4}{5} × \frac{8}{3} - 0.8 × \frac{2}{3}$
$(\frac{3}{8} + \frac{1}{27}) × 8 + \frac{19}{27}$
$\frac{5}{9} × \frac{2}{21} + \frac{5}{9} × \frac{10}{21} + \frac{4}{9} × \frac{4}{7}$

1. $15$
2. $36$
3. $71$
4. $10$
5. $\frac{8}{13}$
6. $20$
7. $1.6$
8. $4$
9. $\frac{4}{7}$