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2. 计算下面各题,能简算的要简算。(28 分)
$\frac{5}{7}×\frac{6}{11}×\frac{7}{10}$ $\frac{7}{8}-\frac{5}{6}×\frac{7}{10}$ $\frac{3}{4}×(\frac{9}{10}-\frac{5}{6})$
$\frac{6}{5}×3.3+\frac{9}{5}×3.3$ $(\frac{4}{5}-\frac{1}{2}+\frac{2}{3})×30$ $2050×\frac{2048}{2049}$
$\frac{7}{8}-\frac{5}{14}×\frac{7}{10}$ $\frac{4}{5}×\frac{3}{8}×\frac{5}{9}$ $1.2×(\frac{2}{3}+\frac{1}{6}-\frac{3}{4})$
$\frac{19}{8}×\frac{7}{12}-\frac{7}{12}×\frac{3}{8}$ $7×(\frac{4}{7}+\frac{1}{15})+\frac{8}{15}$ $\frac{8}{13}×\frac{3}{7}+\frac{5}{13}÷\frac{7}{3}$
$\frac{1}{3}×30\%+\frac{5}{8}÷12.5\%$ $(2.7×40\%+7.3×40\%)÷\frac{16}{5}$
$\frac{5}{7}×\frac{6}{11}×\frac{7}{10}$ $\frac{7}{8}-\frac{5}{6}×\frac{7}{10}$ $\frac{3}{4}×(\frac{9}{10}-\frac{5}{6})$
$\frac{6}{5}×3.3+\frac{9}{5}×3.3$ $(\frac{4}{5}-\frac{1}{2}+\frac{2}{3})×30$ $2050×\frac{2048}{2049}$
$\frac{7}{8}-\frac{5}{14}×\frac{7}{10}$ $\frac{4}{5}×\frac{3}{8}×\frac{5}{9}$ $1.2×(\frac{2}{3}+\frac{1}{6}-\frac{3}{4})$
$\frac{19}{8}×\frac{7}{12}-\frac{7}{12}×\frac{3}{8}$ $7×(\frac{4}{7}+\frac{1}{15})+\frac{8}{15}$ $\frac{8}{13}×\frac{3}{7}+\frac{5}{13}÷\frac{7}{3}$
$\frac{1}{3}×30\%+\frac{5}{8}÷12.5\%$ $(2.7×40\%+7.3×40\%)÷\frac{16}{5}$
答案：
2.$\frac{3}{11}$ $\frac{7}{24}$ $\frac{1}{20}$ 9.9 29 2048$\frac{2048}{2049}$ $\frac{5}{8}$ $\frac{1}{6}$ 0.1 $\frac{7}{6}$ 5 $\frac{3}{7}$ 5.1 $\frac{5}{4}$
3. 把下面各比化成最简整数比,并出求比值。(3 分)
$1.28:0.32$ $\frac{1}{4}L:350\ mL$ $1.2$时$:30$分
$1.28:0.32$ $\frac{1}{4}L:350\ mL$ $1.2$时$:30$分
答案：
3.4:1.4 5:7,$\frac{5}{7}$ 12:5,$\frac{12}{5}$
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