1. 先画一画、涂一涂,再算一算。

$\frac{3}{4} ÷ 3 = \frac{(\quad)}{(\quad)} ◯ \frac{(\quad)}{(\quad)} = \frac{(\quad)}{(\quad)}$

$\frac{3}{4} ÷ 3 = \frac{(\quad) ÷ (\quad)}{4} = \frac{(\quad)}{(\quad)}$
$\frac{3}{4} ÷ 3 = \frac{(\quad)}{(\quad)} ◯ \frac{(\quad)}{(\quad)} = \frac{(\quad)}{(\quad)}$
$\frac{3}{4} ÷ 3 = \frac{(\quad) ÷ (\quad)}{4} = \frac{(\quad)}{(\quad)}$
答案
1. 画图参考
$\frac{3}{4}×\frac{1}{3}=\frac{1}{4}$
$\frac{3÷3}{4}=\frac{1}{4}$
2. 直接写出得数。
$\frac{1}{2} ÷ 10 =$
$\frac{9}{19} ÷ 18 =$
$\frac{1}{2} ÷ \frac{5}{8} =$
$\frac{5}{8} ÷ \frac{1}{4} =$
$12 ÷ \frac{4}{5} =$
$\frac{1}{7} ÷ \frac{5}{21} =$
$\frac{12}{7} ÷ 6 =$
$3 ÷ \frac{39}{4} =$
$\frac{10}{9} ÷ 5 =$
$\frac{1}{2} ÷ 10 =$
$\frac{9}{19} ÷ 18 =$
$\frac{1}{2} ÷ \frac{5}{8} =$
$\frac{5}{8} ÷ \frac{1}{4} =$
$12 ÷ \frac{4}{5} =$
$\frac{1}{7} ÷ \frac{5}{21} =$
$\frac{12}{7} ÷ 6 =$
$3 ÷ \frac{39}{4} =$
$\frac{10}{9} ÷ 5 =$
答案
2. $\frac{1}{20}$ $\frac{1}{38}$ $\frac{4}{5}$ $\frac{5}{2}$ 15 $\frac{3}{5}$ $\frac{2}{7}$ $\frac{4}{13}$ $\frac{2}{9}$
3. 看图列式计算。
(1)
(2)
(1)
(2)
答案
3. (1)$30÷\frac{1}{8}=240(\mathrm{kg})$
(2)$15÷(1-\frac{5}{8})=40(\mathrm{kg})$
(2)$15÷(1-\frac{5}{8})=40(\mathrm{kg})$
4. 递等式计算。
$\frac{5}{11}÷\frac{9}{5}+\frac{4}{9}×\frac{5}{11}$
$(\frac{8}{9}+\frac{4}{27})×3×9$
$\frac{5}{11}÷\frac{9}{5}+\frac{4}{9}×\frac{5}{11}$
$(\frac{8}{9}+\frac{4}{27})×3×9$
答案
4. $\frac{5}{11}$ 28
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