《2025年天天练口算六年级数学上册人教版》

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答案：
答案：
| 图形 | 正方形 | 长方形 | 平行四边形 | 等腰三角形 |
| --- | --- | --- | --- | --- |
| 对称轴条数 | 4 | 2 | 0 | 1 |

$\frac{4}{21}÷ 2=$$\frac{2}{21}$
$\frac{5}{11}× \frac{33}{14}=$$\frac{15}{14}$
$\frac{7}{15}× \frac{5}{14}=$$\frac{1}{6}$
$\frac{18}{11}÷ \frac{2}{3}=$$\frac{27}{11}$
$\frac{20}{21}× \frac{5}{7}=$$\frac{100}{147}$
$\frac{2}{3}× \frac{7}{12}=$$\frac{7}{18}$
$0.5× \frac{3}{5}=$$\frac{3}{10}$
$\frac{21}{40}÷ \frac{1}{10}=$$\frac{21}{4}$
$\frac{1}{3}× 3÷ \frac{1}{2}=$$2$
$1÷ (\frac{1}{6}+\frac{1}{7})=$$\frac{42}{13}$
$1÷ (\frac{1}{3}+\frac{1}{5})=$$\frac{15}{8}$
$15× (1+\frac{1}{5})=$$18$
$16÷ (1+\frac{1}{3})=$$12$
$\frac{2}{3}× \frac{5}{6}÷ \frac{5}{6}=$$\frac{2}{3}$
$\frac{3}{10}× \frac{1}{8}× \frac{10}{9}=$$\frac{1}{24}$
$(\frac{1}{3}+\frac{1}{12})× 12=$$5$

答案： $\frac{4}{21}÷ 2=\frac{4}{21}×\frac{1}{2}=\frac{2}{21}$
$\frac{5}{11}× \frac{33}{14}=\frac{5×3}{14}=\frac{15}{14}$
$\frac{7}{15}× \frac{5}{14}=\frac{1}{3}×\frac{1}{2}=\frac{1}{6}$
$\frac{18}{11}÷ \frac{2}{3}=\frac{18}{11}×\frac{3}{2}=\frac{27}{11}$
$\frac{20}{21}× \frac{5}{7}=\frac{100}{147}$
$\frac{2}{3}× \frac{7}{12}=\frac{1}{3}×\frac{7}{6}=\frac{7}{18}$
$0.5× \frac{3}{5}=\frac{1}{2}×\frac{3}{5}=\frac{3}{10}$
$\frac{21}{40}÷ \frac{1}{10}=\frac{21}{40}×10=\frac{21}{4}$
$\frac{1}{3}× 3÷ \frac{1}{2}=1×2=2$
$1÷ (\frac{1}{6}+\frac{1}{7})=1÷(\frac{7}{42}+\frac{6}{42})=1÷\frac{13}{42}=\frac{42}{13}$
$1÷ (\frac{1}{3}+\frac{1}{5})=1÷(\frac{5}{15}+\frac{3}{15})=1÷\frac{8}{15}=\frac{15}{8}$
$15× (1+\frac{1}{5})=15×1 + 15×\frac{1}{5}=15 + 3=18$
$16÷ (1+\frac{1}{3})=16÷\frac{4}{3}=16×\frac{3}{4}=12$
$\frac{2}{3}× \frac{5}{6}÷ \frac{5}{6}=\frac{2}{3}×(\frac{5}{6}÷\frac{5}{6})=\frac{2}{3}×1=\frac{2}{3}$
$\frac{3}{10}× \frac{1}{8}× \frac{10}{9}=\frac{3}{10}×\frac{10}{9}×\frac{1}{8}=\frac{1}{3}×\frac{1}{8}=\frac{1}{24}$
$(\frac{1}{3}+\frac{1}{12})× 12=\frac{1}{3}×12 + \frac{1}{12}×12=4 + 1=5$