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一、填一填。
1. 48的$\frac{5}{6}$是(
1. 48的$\frac{5}{6}$是(
40
)，(72
)的$\frac{5}{6}$是60。答案
1. 40，72
2. $\frac{1}{10}$的倒数是（
10
），（$\frac{10}{9}$
）和0.9互为倒数。答案
2. 10，$\frac{10}{9}$
3.有4千克奶糖，每$\frac{2}{5}$千克装一袋，一共可以装（
10
）袋。答案
3. 10
4. 比 90 kg 多$\frac{1}{5}$是(
108
)kg；(7.2
)t 比 8.4t 少$\frac{1}{7}$；6t 比(8
)t 少$\frac{1}{4}$。答案
4. 108kg，7.2t，8t
5.在○里填上“＞”“＜”或“=”。
$\frac{7}{9}×\frac{3}{4}$○$\frac{3}{4}$
$\frac{7}{8}÷\frac{7}{8}$○$\frac{7}{8}×\frac{7}{8}$
$\frac{13}{21}×\frac{7}{9}$○$\frac{13}{21}$
$\frac{7}{9}×\frac{3}{4}$○$\frac{3}{4}$
$\frac{7}{8}÷\frac{7}{8}$○$\frac{7}{8}×\frac{7}{8}$
$\frac{13}{21}×\frac{7}{9}$○$\frac{13}{21}$
答案
5. ＜ ＞ ＜
6. 田田将20g白糖放入80g水中，她喝了这杯糖水的$\frac{2}{5}$，她喝了（
40
）g糖水。答案
6. 40g
1.直接写出得数。
$18×\frac{5}{9}=$
$\frac{2}{9}×\frac{21}{8}=$
$0.2×\frac{3}{7}=$
$\frac{12}{25}÷\frac{4}{5}=$
$\frac{9}{26}÷\frac{3}{13}=$
$\frac{6}{11}×\frac{5}{18}=$
$7.2÷\frac{8}{9}=$
$\frac{5}{18}÷\frac{2}{9}=$
$18×\frac{5}{9}=$
$\frac{2}{9}×\frac{21}{8}=$
$0.2×\frac{3}{7}=$
$\frac{12}{25}÷\frac{4}{5}=$
$\frac{9}{26}÷\frac{3}{13}=$
$\frac{6}{11}×\frac{5}{18}=$
$7.2÷\frac{8}{9}=$
$\frac{5}{18}÷\frac{2}{9}=$
答案
1. $10$，$\frac{7}{12}$，$\frac{3}{35}$，$\frac{3}{5}$，$\frac{3}{2}$，$\frac{5}{33}$，$8.1$，$\frac{5}{4}$
2.计算下列各题,能简算的要简算。
$\frac{7}{10}÷8÷\frac{14}{5}$
$(\frac{11}{24}+\frac{7}{12}-\frac{5}{6})÷\frac{1}{48}$
$29×\frac{27}{28}-\frac{1}{28}$
$\frac{7}{10}÷8÷\frac{14}{5}$
$(\frac{11}{24}+\frac{7}{12}-\frac{5}{6})÷\frac{1}{48}$
$29×\frac{27}{28}-\frac{1}{28}$
答案
2.
$\begin{aligned}\frac{7}{10}÷8÷\frac{14}{5}&=\frac{7}{10}×\frac{1}{8}×\frac{5}{14}\\&=\frac{7}{10}×\frac{5}{14}×\frac{1}{8}\\&=\frac{1}{32}\end{aligned}$
$\begin{aligned}(\frac{11}{24}+\frac{7}{12}-\frac{5}{6})÷\frac{1}{48}&=(\frac{11}{24}+\frac{7}{12}-\frac{5}{6})×48\\&=\frac{11}{24}×48+\frac{7}{12}×48-\frac{5}{6}×48\\&=22+28-40\\&=10\end{aligned}$
$\begin{aligned}29×\frac{27}{28}-\frac{1}{28}&=(28+1)×\frac{27}{28}-\frac{1}{28}\\&=28×\frac{27}{28}+1×\frac{27}{28}-\frac{1}{28}\\&=27+\frac{27}{28}-\frac{1}{28}\\&=27\frac{13}{14}\end{aligned}$
$\begin{aligned}\frac{7}{10}÷8÷\frac{14}{5}&=\frac{7}{10}×\frac{1}{8}×\frac{5}{14}\\&=\frac{7}{10}×\frac{5}{14}×\frac{1}{8}\\&=\frac{1}{32}\end{aligned}$
$\begin{aligned}(\frac{11}{24}+\frac{7}{12}-\frac{5}{6})÷\frac{1}{48}&=(\frac{11}{24}+\frac{7}{12}-\frac{5}{6})×48\\&=\frac{11}{24}×48+\frac{7}{12}×48-\frac{5}{6}×48\\&=22+28-40\\&=10\end{aligned}$
$\begin{aligned}29×\frac{27}{28}-\frac{1}{28}&=(28+1)×\frac{27}{28}-\frac{1}{28}\\&=28×\frac{27}{28}+1×\frac{27}{28}-\frac{1}{28}\\&=27+\frac{27}{28}-\frac{1}{28}\\&=27\frac{13}{14}\end{aligned}$
