1. 算一算。
$\frac{5}{9} × \frac{3}{10} =$$ $$\frac{7}{11} ÷ \frac{7}{10} =$
$\frac{7}{20} ÷ 7 =$$ $$\frac{4}{19} ÷ \frac{4}{5} =$
$\frac{11}{20} ÷ \frac{11}{10} =$$ $$0.12 ÷ \frac{2}{5} =$
$\frac{7}{100} ÷ 7 =$$ $$\frac{3}{11} × \frac{3}{10} =$
$1 ÷ \frac{1}{6} =$$ $$\frac{5}{7} × \frac{5}{12} =$
$\frac{7}{19} × 1 =$$ $$\frac{5}{14} ÷ \frac{5}{6} =$
$\frac{1}{9} ÷ \frac{2}{3} =$$ $$0.25 ÷ \frac{3}{4} =$
$0 ÷ \frac{98}{99} =$$ $$\frac{5}{8} ÷ \frac{1}{3} =$
$\frac{5}{9} × \frac{3}{10} =$$ $$\frac{7}{11} ÷ \frac{7}{10} =$
$\frac{7}{20} ÷ 7 =$$ $$\frac{4}{19} ÷ \frac{4}{5} =$
$\frac{11}{20} ÷ \frac{11}{10} =$$ $$0.12 ÷ \frac{2}{5} =$
$\frac{7}{100} ÷ 7 =$$ $$\frac{3}{11} × \frac{3}{10} =$
$1 ÷ \frac{1}{6} =$$ $$\frac{5}{7} × \frac{5}{12} =$
$\frac{7}{19} × 1 =$$ $$\frac{5}{14} ÷ \frac{5}{6} =$
$\frac{1}{9} ÷ \frac{2}{3} =$$ $$0.25 ÷ \frac{3}{4} =$
$0 ÷ \frac{98}{99} =$$ $$\frac{5}{8} ÷ \frac{1}{3} =$
答案:
$\frac{5}{9} × \frac{3}{10} = \frac{1}{6}$
$\frac{7}{11} ÷ \frac{7}{10} = \frac{10}{11}$
$\frac{7}{20} ÷ 7 = \frac{1}{20}$
$\frac{4}{19} ÷ \frac{4}{5} = \frac{5}{19}$
$\frac{11}{20} ÷ \frac{11}{10} = \frac{1}{2}$
$0.12 ÷ \frac{2}{5} = 0.3$
$\frac{7}{100} ÷ 7 = \frac{1}{100}$
$\frac{3}{11} × \frac{3}{10} = \frac{9}{110}$
$1 ÷ \frac{1}{6} = 6$
$\frac{5}{7} × \frac{5}{12} = \frac{25}{84}$
$\frac{7}{19} × 1 = \frac{7}{19}$
$\frac{5}{14} ÷ \frac{5}{6} = \frac{3}{7}$
$\frac{1}{9} ÷ \frac{2}{3} = \frac{1}{6}$
$0.25 ÷ \frac{3}{4} = \frac{1}{3}$
$0 ÷ \frac{98}{99} = 0$
$\frac{5}{8} ÷ \frac{1}{3} = \frac{15}{8}$
$\frac{7}{11} ÷ \frac{7}{10} = \frac{10}{11}$
$\frac{7}{20} ÷ 7 = \frac{1}{20}$
$\frac{4}{19} ÷ \frac{4}{5} = \frac{5}{19}$
$\frac{11}{20} ÷ \frac{11}{10} = \frac{1}{2}$
$0.12 ÷ \frac{2}{5} = 0.3$
$\frac{7}{100} ÷ 7 = \frac{1}{100}$
$\frac{3}{11} × \frac{3}{10} = \frac{9}{110}$
$1 ÷ \frac{1}{6} = 6$
$\frac{5}{7} × \frac{5}{12} = \frac{25}{84}$
$\frac{7}{19} × 1 = \frac{7}{19}$
$\frac{5}{14} ÷ \frac{5}{6} = \frac{3}{7}$
$\frac{1}{9} ÷ \frac{2}{3} = \frac{1}{6}$
$0.25 ÷ \frac{3}{4} = \frac{1}{3}$
$0 ÷ \frac{98}{99} = 0$
$\frac{5}{8} ÷ \frac{1}{3} = \frac{15}{8}$
2. 比一比。
$\frac{1}{2} ÷ \frac{1}{2} ◯ 1$$ $$\frac{3}{11} ÷ \frac{3}{10} ◯ 1$
$\frac{8}{9} ÷ 1 ◯ \frac{8}{9}$$ $$\frac{5}{12} ÷ \frac{1}{2} ◯ \frac{5}{12}$
$\frac{5}{8} ÷ \frac{5}{3} ◯ \frac{5}{8}$$ $$\frac{2}{5} ÷ 7 ◯ \frac{2}{5}$

$\frac{1}{2} ÷ \frac{1}{2} ◯ 1$$ $$\frac{3}{11} ÷ \frac{3}{10} ◯ 1$
$\frac{8}{9} ÷ 1 ◯ \frac{8}{9}$$ $$\frac{5}{12} ÷ \frac{1}{2} ◯ \frac{5}{12}$
$\frac{5}{8} ÷ \frac{5}{3} ◯ \frac{5}{8}$$ $$\frac{2}{5} ÷ 7 ◯ \frac{2}{5}$
答案:
$\frac{1}{2} ÷ \frac{1}{2} = 1$,所以填“$=$”;
$\frac{3}{11} ÷ \frac{3}{10} = \frac{3}{11}×\frac{10}{3} = \frac{10}{11}$,$\frac{10}{11} < 1$,所以填“$<$”;
$\frac{8}{9} ÷ 1 = \frac{8}{9}$,所以填“$=$”;
$\frac{5}{12} ÷ \frac{1}{2} = \frac{5}{12}×2 = \frac{5}{6}$,$\frac{5}{6} > \frac{5}{12}$,所以填“$>$”;
$\frac{5}{8} ÷ \frac{5}{3} = \frac{5}{8}×\frac{3}{5} = \frac{3}{8}$,$\frac{3}{8} < \frac{5}{8}$,所以填“$<$”;
$\frac{2}{5} ÷ 7 = \frac{2}{5}×\frac{1}{7} = \frac{2}{35}$,$\frac{2}{35} < \frac{2}{5}$,所以填“$<$”。
$=$;$<$;$=$;$>$;$<$;$<$
$\frac{3}{11} ÷ \frac{3}{10} = \frac{3}{11}×\frac{10}{3} = \frac{10}{11}$,$\frac{10}{11} < 1$,所以填“$<$”;
$\frac{8}{9} ÷ 1 = \frac{8}{9}$,所以填“$=$”;
$\frac{5}{12} ÷ \frac{1}{2} = \frac{5}{12}×2 = \frac{5}{6}$,$\frac{5}{6} > \frac{5}{12}$,所以填“$>$”;
$\frac{5}{8} ÷ \frac{5}{3} = \frac{5}{8}×\frac{3}{5} = \frac{3}{8}$,$\frac{3}{8} < \frac{5}{8}$,所以填“$<$”;
$\frac{2}{5} ÷ 7 = \frac{2}{5}×\frac{1}{7} = \frac{2}{35}$,$\frac{2}{35} < \frac{2}{5}$,所以填“$<$”。
$=$;$<$;$=$;$>$;$<$;$<$
2
看图列式计算。
大正方形的面积是 1,深色部分的面积表示为:
(1)

$( ) ÷ ( ) = ( )$
(2)

$( ) ÷ ( ) = ( )$
(3)

$( ) ÷ ( ) = ( )$
看图列式计算。
大正方形的面积是 1,深色部分的面积表示为:
(1)
$( ) ÷ ( ) = ( )$
(2)
$( ) ÷ ( ) = ( )$
(3)
$( ) ÷ ( ) = ( )$
答案:
(1)$\frac{1}{2}÷ 4=\frac{1}{8}$
(2)$\frac{2}{3}÷ 3=\frac{2}{9}$
(3)$\frac{1}{4}÷ 4$$=\frac{1}{16}$
(1)$\frac{1}{2}÷ 4=\frac{1}{8}$
(2)$\frac{2}{3}÷ 3=\frac{2}{9}$
(3)$\frac{1}{4}÷ 4$$=\frac{1}{16}$
趣味数学
请把下面的成语补充完整,你发现了什么有趣的结果?
不计其( ) ( )而不厌 神魂颠( ) ( )一数二
有机可( ) ( )不阿贵 药到病( ) ( )不徇情
请把下面的成语补充完整,你发现了什么有趣的结果?
不计其( ) ( )而不厌 神魂颠( ) ( )一数二
有机可( ) ( )不阿贵 药到病( ) ( )不徇情
答案:
数 学 倒 数 乘 法 除 法
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