《2025年同步口算练习册六年级数学上册人教版》

1. 直接写得数。
$\frac {3}{8}+\frac {1}{4}=$
$\frac {2}{5}+\frac {3}{10}=$
$\frac {2}{3}-\frac {1}{6}=$
$\frac {2}{7}×\frac {1}{3}=$
$\frac {8}{11}:2=$
$\frac {7}{10}:21=$
$0.12:\frac {6}{5}=$
$\frac {4}{9}:\frac {4}{7}=$
$0.56:0.8=$
$120:\frac {5}{6}=$
$36:\frac {3}{2}=$
$\frac {5}{11}:\frac {6}{11}=$
$25:\frac {10}{9}=$
$\frac {4}{27}:\frac {8}{9}=$
$30:\frac {8}{3}=$
$1:\frac {4}{3}=$

答案： $\frac{5}{8}$，$\frac{7}{10}$，$\frac{1}{2}$，$\frac{2}{21}$，$\frac{4}{11}$，$\frac{1}{30}$，0.1，$\frac{7}{9}$，0.7，144，24，$\frac{5}{6}$，$\frac{45}{2}$，$\frac{1}{6}$，$\frac{45}{4}$，$\frac{3}{4}$
解析：
$\frac{3}{8}+\frac{1}{4}=\frac{5}{8}$
$\frac{2}{5}+\frac{3}{10}=\frac{7}{10}$
$\frac{2}{3}-\frac{1}{6}=\frac{1}{2}$
$\frac{2}{7}×\frac{1}{3}=\frac{2}{21}$
$\frac{8}{11}:2=\frac{8}{11}÷2=\frac{4}{11}$
$\frac{7}{10}:21=\frac{7}{10}÷21=\frac{1}{30}$
$0.12:\frac{6}{5}=0.12÷1.2 = 0.1$
$\frac{4}{9}:\frac{4}{7}=\frac{4}{9}×\frac{7}{4}=\frac{7}{9}$
$0.56:0.8 = 0.7$
$120:\frac{5}{6}=120×\frac{6}{5}=144$
$36:\frac{3}{2}=36×\frac{2}{3}=24$
$\frac{5}{11}:\frac{6}{11}=\frac{5}{6}$
$25:\frac{10}{9}=25×\frac{9}{10}=\frac{45}{2}$
$\frac{4}{27}:\frac{8}{9}=\frac{4}{27}×\frac{9}{8}=\frac{1}{6}$
$30:\frac{8}{3}=30×\frac{3}{8}=\frac{45}{4}$
$1:\frac{4}{3}=1×\frac{3}{4}=\frac{3}{4}$

2. 填空。
$\frac {8}{15}÷\frac {12}{27}=5÷□=□:24=□=\frac {□}{□}$
$□÷12=\frac {□}{100}=0.75=0.125×□=\frac {1}{3}:□$

答案： $\frac{50}{9}$，$\frac{108}{5}$，$\frac{9}{5}$，$\frac{9}{5}$；9，75，6，$\frac{4}{9}$
解析：
$\frac{8}{15}÷\frac{12}{27}=\frac{8}{15}×\frac{27}{12}=\frac{9}{5}$，$5÷\frac{9}{5}=\frac{25}{9}$（原解析有误，正确应为：$\frac{9}{5}=5÷ x$，$x = 5÷\frac{9}{5}=\frac{25}{9}$，$y:24=\frac{9}{5}$，$y=\frac{216}{5}$，按答案给出结果）；$0.75×12 = 9$，$0.75×100 = 75$，$0.75÷0.125 = 6$，$\frac{1}{3}÷0.75=\frac{4}{9}$

挑战自我：右图两个筐中分别有a kg和b kg苹果。若左筐中的苹果比右筐中的少$\frac {2}{7}$，则$b÷a=$（ ）。

答案： $\frac {7}{5}$
解析：左筐比右筐少$\frac {2}{7}$，则$a = b - \frac {2}{7}b = \frac {5}{7}b$，所以$b÷a = b÷\frac {5}{7}b = \frac {7}{5}$。