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一、口算。
$10×\dfrac{9}{20}=$
$\dfrac{3}{5}×10=$
$\dfrac{2}{3}+\dfrac{3}{4}=$
$\dfrac{4}{5}-\dfrac{3}{10}=$
$\dfrac{5}{9}+\dfrac{7}{30}=$
$42×\dfrac{5}{6}=$
$\dfrac{1}{8}×\dfrac{1}{8}=$
$10×\dfrac{9}{20}=$
$\dfrac{9}{2}$
$4×\dfrac{3}{8}=$$\dfrac{3}{2}$
$\dfrac{5}{6}×\dfrac{9}{20}=$$\dfrac{3}{8}$
$\dfrac{3}{5}×10=$
6
$\dfrac{8}{9}×1.5=$$\dfrac{4}{3}$
$81×\dfrac{7}{9}=$63
$\dfrac{2}{3}+\dfrac{3}{4}=$
$\dfrac{17}{12}$
$\dfrac{7}{8}-\dfrac{3}{4}=$$\dfrac{1}{8}$
$\dfrac{5}{7}×\dfrac{7}{10}=$$\dfrac{1}{2}$
$\dfrac{4}{5}-\dfrac{3}{10}=$
$\dfrac{1}{2}$
$\dfrac{2}{3}×\dfrac{3}{4}=$$\dfrac{1}{2}$
$\dfrac{8}{13}×\dfrac{13}{20}=$$\dfrac{2}{5}$
$\dfrac{5}{9}+\dfrac{7}{30}=$
$\dfrac{71}{90}$
$\dfrac{5}{6}×\dfrac{8}{15}=$$\dfrac{4}{9}$
$\dfrac{4}{7}×\dfrac{7}{8}=$$\dfrac{1}{2}$
$42×\dfrac{5}{6}=$
35
$\dfrac{7}{32}×\dfrac{4}{7}=$$\dfrac{1}{8}$
$\dfrac{5}{2}-\dfrac{2}{5}=$$\dfrac{21}{10}$
$\dfrac{1}{8}×\dfrac{1}{8}=$
$\dfrac{1}{64}$
$\dfrac{8}{9}-\dfrac{1}{6}=$$\dfrac{13}{18}$
$\dfrac{11}{26}×13=$$\dfrac{11}{2}$
答案
一、$\dfrac{9}{2}$ $\dfrac{3}{2}$ $\dfrac{3}{8}$
6 $\dfrac{4}{3}$ 63
$\dfrac{17}{12}$ $\dfrac{1}{8}$ $\dfrac{1}{2}$
$\dfrac{1}{2}$ $\dfrac{1}{2}$ $\dfrac{2}{5}$
$\dfrac{71}{90}$ $\dfrac{4}{9}$ $\dfrac{1}{2}$
35 $\dfrac{1}{8}$ $\dfrac{21}{10}$
$\dfrac{1}{64}$ $\dfrac{13}{18}$ $\dfrac{11}{2}$
6 $\dfrac{4}{3}$ 63
$\dfrac{17}{12}$ $\dfrac{1}{8}$ $\dfrac{1}{2}$
$\dfrac{1}{2}$ $\dfrac{1}{2}$ $\dfrac{2}{5}$
$\dfrac{71}{90}$ $\dfrac{4}{9}$ $\dfrac{1}{2}$
35 $\dfrac{1}{8}$ $\dfrac{21}{10}$
$\dfrac{1}{64}$ $\dfrac{13}{18}$ $\dfrac{11}{2}$
二、计算下面各题。
$\dfrac{9}{32}×\dfrac{22}{15}×\dfrac{16}{99}$ $\dfrac{10}{21}×\dfrac{12}{25}×\dfrac{7}{8}$ $\dfrac{6}{5}×\dfrac{1}{12}×\dfrac{5}{7}$
$\dfrac{11}{9}×\dfrac{2}{3}×\dfrac{21}{22}$ $\dfrac{8}{15}×35×\dfrac{3}{14}$ $12×\dfrac{4}{3}×\dfrac{4}{7}$
$\dfrac{9}{32}×\dfrac{22}{15}×\dfrac{16}{99}$ $\dfrac{10}{21}×\dfrac{12}{25}×\dfrac{7}{8}$ $\dfrac{6}{5}×\dfrac{1}{12}×\dfrac{5}{7}$
$\dfrac{11}{9}×\dfrac{2}{3}×\dfrac{21}{22}$ $\dfrac{8}{15}×35×\dfrac{3}{14}$ $12×\dfrac{4}{3}×\dfrac{4}{7}$
答案
1. 计算$\frac{9}{32}×\frac{22}{15}×\frac{16}{99}$：
解：
$\frac{9}{32}×\frac{22}{15}×\frac{16}{99}=\frac{9×22×16}{32×15×99}$
约分可得：$\frac{1×1×1}{2×5×1}=\frac{1}{10}$
2. 计算$\frac{10}{21}×\frac{12}{25}×\frac{7}{8}$：
解：
$\frac{10}{21}×\frac{12}{25}×\frac{7}{8}=\frac{10×12×7}{21×25×8}$
约分可得：$\frac{1×2×1}{1×5×2}=\frac{1}{5}$
3. 计算$\frac{6}{5}×\frac{1}{12}×\frac{5}{7}$：
解：
$\frac{6}{5}×\frac{1}{12}×\frac{5}{7}=\frac{6×1×5}{5×12×7}$
约分可得：$\frac{1×1×1}{1×2×7}=\frac{1}{14}$
4. 计算$\frac{11}{9}×\frac{2}{3}×\frac{21}{22}$：
解：
$\frac{11}{9}×\frac{2}{3}×\frac{21}{22}=\frac{11×2×21}{9×3×22}$
约分可得：$\frac{1×2×7}{3×3×2}=\frac{7}{9}$
5. 计算$\frac{8}{15}×35×\frac{3}{14}$：
解：
$\frac{8}{15}×35×\frac{3}{14}=\frac{8×35×3}{15×14}$
约分可得：$\frac{8×5×3}{3×14}=\frac{8×5}{14}=\frac{20}{7}$
6. 计算$12×\frac{4}{3}×\frac{4}{7}$：
解：
$12×\frac{4}{3}×\frac{4}{7}=\frac{12×4×4}{3×7}$
约分可得：$\frac{4×4×4}{7}=\frac{64}{7}$
综上，答案依次为$\frac{1}{10}$；$\frac{1}{5}$；$\frac{1}{14}$；$\frac{7}{9}$；$\frac{20}{7}$；$\frac{64}{7}$。
解：
$\frac{9}{32}×\frac{22}{15}×\frac{16}{99}=\frac{9×22×16}{32×15×99}$
约分可得：$\frac{1×1×1}{2×5×1}=\frac{1}{10}$
2. 计算$\frac{10}{21}×\frac{12}{25}×\frac{7}{8}$：
解：
$\frac{10}{21}×\frac{12}{25}×\frac{7}{8}=\frac{10×12×7}{21×25×8}$
约分可得：$\frac{1×2×1}{1×5×2}=\frac{1}{5}$
3. 计算$\frac{6}{5}×\frac{1}{12}×\frac{5}{7}$：
解：
$\frac{6}{5}×\frac{1}{12}×\frac{5}{7}=\frac{6×1×5}{5×12×7}$
约分可得：$\frac{1×1×1}{1×2×7}=\frac{1}{14}$
4. 计算$\frac{11}{9}×\frac{2}{3}×\frac{21}{22}$：
解：
$\frac{11}{9}×\frac{2}{3}×\frac{21}{22}=\frac{11×2×21}{9×3×22}$
约分可得：$\frac{1×2×7}{3×3×2}=\frac{7}{9}$
5. 计算$\frac{8}{15}×35×\frac{3}{14}$：
解：
$\frac{8}{15}×35×\frac{3}{14}=\frac{8×35×3}{15×14}$
约分可得：$\frac{8×5×3}{3×14}=\frac{8×5}{14}=\frac{20}{7}$
6. 计算$12×\frac{4}{3}×\frac{4}{7}$：
解：
$12×\frac{4}{3}×\frac{4}{7}=\frac{12×4×4}{3×7}$
约分可得：$\frac{4×4×4}{7}=\frac{64}{7}$
综上，答案依次为$\frac{1}{10}$；$\frac{1}{5}$；$\frac{1}{14}$；$\frac{7}{9}$；$\frac{20}{7}$；$\frac{64}{7}$。
