1. 直接写出得数。（4 分）
$\frac{1}{2}×\frac{3}{8}=$ $\frac{5}{9}×\frac{3}{10}=$ $28×\frac{3}{4}=$ $\frac{4}{15}×\frac{5}{24}=$
$\frac{8}{11}×\frac{5}{4}=$ $\frac{4}{9}×\frac{27}{16}=$ $\frac{15}{16}×\frac{4}{3}=$ $\frac{8}{21}×63=$
$\frac{1}{2}×\frac{3}{8}=$ $\frac{5}{9}×\frac{3}{10}=$ $28×\frac{3}{4}=$ $\frac{4}{15}×\frac{5}{24}=$
$\frac{8}{11}×\frac{5}{4}=$ $\frac{4}{9}×\frac{27}{16}=$ $\frac{15}{16}×\frac{4}{3}=$ $\frac{8}{21}×63=$
答案：@@1. $\frac{3}{16}$ $\frac{1}{6}$ 21 $\frac{1}{18}$ $\frac{10}{11}$ $\frac{3}{4}$ $\frac{5}{4}$ 24
2. 计算下面各题。（12 分）
$36×\frac{4}{9}×\frac{3}{2}$ $\frac{14}{15}×25×\frac{5}{7}$ $\frac{15}{16}×\frac{20}{21}×\frac{1}{5}$
$\frac{9}{10}×\frac{2}{3}×\frac{5}{6}$ $\frac{5}{4}×\frac{1}{8}×16$ $\frac{13}{33}×\frac{11}{26}×\frac{3}{4}$
$36×\frac{4}{9}×\frac{3}{2}$ $\frac{14}{15}×25×\frac{5}{7}$ $\frac{15}{16}×\frac{20}{21}×\frac{1}{5}$
$\frac{9}{10}×\frac{2}{3}×\frac{5}{6}$ $\frac{5}{4}×\frac{1}{8}×16$ $\frac{13}{33}×\frac{11}{26}×\frac{3}{4}$
答案：2. 24 $\frac{50}{3}$ $\frac{5}{28}$ $\frac{1}{2}$ $\frac{5}{2}$ $\frac{1}{8}$
3. 看图列式计算。（8 分）
(1)
(2)
(3)
(4)
(1)
(2)(3)
(4)答案：3. (1) $1 - \frac{3}{5} = \frac{2}{5}$ $400 × \frac{2}{5} = 160$ (米)
(2) $120 × \frac{1}{5} = 24$ (吨)
(3) $76 × \frac{1}{4} = 19$ (只)
(4) $280 × \frac{5}{7} × \frac{1}{2} = 100$ (本)
(2) $120 × \frac{1}{5} = 24$ (吨)
(3) $76 × \frac{1}{4} = 19$ (只)
(4) $280 × \frac{5}{7} × \frac{1}{2} = 100$ (本)