1 分一分、涂一涂、算一算。
(1) $$
$$ $\frac{3}{5} ÷ 3 =$
(2) $$ $\frac{2}{7} ÷ 2 =$
(1) $$
(2) $$ $\frac{2}{7} ÷ 2 =$
答案
(1) $\frac{1}{5}$(或$\frac{3}{15}$);(2) $\frac{1}{7}$(或$\frac{2}{14}$)
(1)$\frac{3}{8}÷6$表示把$\frac{3}{8}$平均分成()份,求()份是多少,也就是求$\frac{3}{8}$的()是多少,所以
$\frac{3}{8}÷6=\frac{3}{8}×( )=( )$
$\frac{3}{8}÷6=\frac{3}{8}×( )=( )$
答案
(1) 6;1;$\frac{1}{6}$;$\frac{1}{6}$;$\frac{1}{16}$
(2)把$\frac{4}{9}$ m 平均分成 5 份,每份是( $\frac{4}{45}$ )m。
答案
(2) $\frac{4}{45}$
(3)(
(4)(
$\frac{3}{20}$
)乘5等于$\dfrac{3}{4}$。(4)(
45
)m的$\dfrac{2}{3}$是30 m。答案
(3) $\frac{3}{20}$;(4) 45
3 计算下面各题。
$\frac{6}{7}÷2=$
$\frac{1}{8}÷\frac{5}{2}=$
$\frac{11}{15}÷33=$
$\frac{3}{4}÷\frac{7}{8}=$
$\frac{2}{15}÷1=$
$\frac{3}{7}÷\frac{7}{8}=$
$16÷\frac{5}{8}=$
$\frac{1}{3}÷4=$
$\frac{7}{9}÷\frac{7}{10}=$
$\frac{5}{6}÷\frac{7}{18}=$
$\frac{2}{7}÷6=$
$9÷\frac{3}{4}=$
$\frac{6}{7}÷2=$
$\frac{1}{8}÷\frac{5}{2}=$
$\frac{11}{15}÷33=$
$\frac{3}{4}÷\frac{7}{8}=$
$\frac{2}{15}÷1=$
$\frac{3}{7}÷\frac{7}{8}=$
$16÷\frac{5}{8}=$
$\frac{1}{3}÷4=$
$\frac{7}{9}÷\frac{7}{10}=$
$\frac{5}{6}÷\frac{7}{18}=$
$\frac{2}{7}÷6=$
$9÷\frac{3}{4}=$
答案
$\frac{3}{7}$;$\frac{1}{20}$;$\frac{1}{45}$
$\frac{6}{7}$;$\frac{2}{15}$;$\frac{24}{49}$
$\frac{128}{5}$;$\frac{1}{12}$;$1\frac{1}{9}$
$2\frac{1}{7}$ ;$\frac{1}{21}$;12
$\frac{6}{7}$;$\frac{2}{15}$;$\frac{24}{49}$
$\frac{128}{5}$;$\frac{1}{12}$;$1\frac{1}{9}$
$2\frac{1}{7}$ ;$\frac{1}{21}$;12
4 填一填。
$(\quad) × 8 = \frac{2}{3}$
$6 × (\quad) = \frac{3}{5}$
$7 × (\quad) = \frac{1}{2}$
$(\quad) × 9 = \frac{2}{7}$
$(\quad) × 15 = \frac{1}{8}$
$(\quad) × 4 = \frac{1}{10}$
$5 × (\quad) = \frac{9}{10}$
$6 × (\quad) = \frac{2}{3}$
$(\quad) × 8 = \frac{2}{3}$
$6 × (\quad) = \frac{3}{5}$
$7 × (\quad) = \frac{1}{2}$
$(\quad) × 9 = \frac{2}{7}$
$(\quad) × 15 = \frac{1}{8}$
$(\quad) × 4 = \frac{1}{10}$
$5 × (\quad) = \frac{9}{10}$
$6 × (\quad) = \frac{2}{3}$
答案
$\frac{1}{12}$;$\frac{1}{10}$
$\frac{1}{14}$;$\frac{2}{63}$
$\frac{1}{120}$;$\frac{1}{40}$
$\frac{9}{50}$;$\frac{1}{9}$
$\frac{1}{14}$;$\frac{2}{63}$
$\frac{1}{120}$;$\frac{1}{40}$
$\frac{9}{50}$;$\frac{1}{9}$
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