1. 直接写出得数。
$\frac{24}{25} ÷ 8 =$
$12 ÷ \frac{1}{4} =$
$\frac{1}{35} ÷ \frac{3}{5} =$
$\frac{21}{5} ÷ 7 =$
$\frac{2}{5} ÷ 5 =$
$\frac{2}{7} ÷ \frac{4}{7} =$
$0.5 ÷ \frac{1}{4} =$
$\frac{3}{16} ÷ \frac{7}{8} =$
$\frac{9}{10} ÷ \frac{2}{15} =$
$4.6 ÷ \frac{23}{24} =$
$\frac{5}{14} ÷ \frac{20}{21} =$
$\frac{4}{7} ÷ 7 =$
$\frac{9}{16} ÷ \frac{6}{7} × \frac{2}{7} =$
$\frac{9}{8} ÷ \frac{3}{4} ÷ \frac{9}{10} =$
$\frac{7}{10} ÷ \frac{3}{7} × \frac{3}{49} =$
$\frac{24}{25} ÷ 8 =$
$12 ÷ \frac{1}{4} =$
$\frac{1}{35} ÷ \frac{3}{5} =$
$\frac{21}{5} ÷ 7 =$
$\frac{2}{5} ÷ 5 =$
$\frac{2}{7} ÷ \frac{4}{7} =$
$0.5 ÷ \frac{1}{4} =$
$\frac{3}{16} ÷ \frac{7}{8} =$
$\frac{9}{10} ÷ \frac{2}{15} =$
$4.6 ÷ \frac{23}{24} =$
$\frac{5}{14} ÷ \frac{20}{21} =$
$\frac{4}{7} ÷ 7 =$
$\frac{9}{16} ÷ \frac{6}{7} × \frac{2}{7} =$
$\frac{9}{8} ÷ \frac{3}{4} ÷ \frac{9}{10} =$
$\frac{7}{10} ÷ \frac{3}{7} × \frac{3}{49} =$
答案
$\frac{24}{25} ÷ 8 = \frac{3}{25}$
$12 ÷ \frac{1}{4} = 48$
$\frac{1}{35} ÷ \frac{3}{5} = \frac{1}{21}$
$\frac{21}{5} ÷ 7 = \frac{3}{5}$
$\frac{2}{5} ÷ 5 = \frac{2}{25}$
$\frac{2}{7} ÷ \frac{4}{7} = \frac{1}{2}$
$0.5 ÷ \frac{1}{4} = 2$
$\frac{3}{16} ÷ \frac{7}{8} = \frac{3}{14}$
$\frac{9}{10} ÷ \frac{2}{15} = \frac{27}{4}$
$4.6 ÷ \frac{23}{24} = 4.8$
$\frac{5}{14} ÷ \frac{20}{21} = \frac{3}{8}$
$\frac{4}{7} ÷ 7 = \frac{4}{49}$
$\frac{9}{16} ÷ \frac{6}{7} × \frac{2}{7} = \frac{3}{16}$
$\frac{9}{8} ÷ \frac{3}{4} ÷ \frac{9}{10} = \frac{5}{3}$
$\frac{7}{10} ÷ \frac{3}{7} × \frac{3}{49} = \frac{1}{10}$
$12 ÷ \frac{1}{4} = 48$
$\frac{1}{35} ÷ \frac{3}{5} = \frac{1}{21}$
$\frac{21}{5} ÷ 7 = \frac{3}{5}$
$\frac{2}{5} ÷ 5 = \frac{2}{25}$
$\frac{2}{7} ÷ \frac{4}{7} = \frac{1}{2}$
$0.5 ÷ \frac{1}{4} = 2$
$\frac{3}{16} ÷ \frac{7}{8} = \frac{3}{14}$
$\frac{9}{10} ÷ \frac{2}{15} = \frac{27}{4}$
$4.6 ÷ \frac{23}{24} = 4.8$
$\frac{5}{14} ÷ \frac{20}{21} = \frac{3}{8}$
$\frac{4}{7} ÷ 7 = \frac{4}{49}$
$\frac{9}{16} ÷ \frac{6}{7} × \frac{2}{7} = \frac{3}{16}$
$\frac{9}{8} ÷ \frac{3}{4} ÷ \frac{9}{10} = \frac{5}{3}$
$\frac{7}{10} ÷ \frac{3}{7} × \frac{3}{49} = \frac{1}{10}$
2. 在〇里填上 “>”“<” 或 “=”。
$\frac{8}{11} × \frac{1}{5} ◯ \frac{8}{11} ÷5$
$\frac{25}{28} × \frac{1}{4} ◯ \frac{15}{28} ÷4$
$\frac{1}{8} ÷ \frac{10}{9} ◯ \frac{1}{8} ÷ \frac{9}{10}$
$\frac{15}{22} × \frac{5}{11} ◯ \frac{15}{22} ÷ \frac{25}{44}$
$\frac{5}{7} ×1.4 ◯ 2.5 ÷ \frac{5}{2}$
$\frac{1}{2} ÷ \frac{1}{7} ◯ \frac{4}{3} ÷ \frac{1}{7}$
$\frac{8}{11} × \frac{1}{5} ◯ \frac{8}{11} ÷5$
$\frac{25}{28} × \frac{1}{4} ◯ \frac{15}{28} ÷4$
$\frac{1}{8} ÷ \frac{10}{9} ◯ \frac{1}{8} ÷ \frac{9}{10}$
$\frac{15}{22} × \frac{5}{11} ◯ \frac{15}{22} ÷ \frac{25}{44}$
$\frac{5}{7} ×1.4 ◯ 2.5 ÷ \frac{5}{2}$
$\frac{1}{2} ÷ \frac{1}{7} ◯ \frac{4}{3} ÷ \frac{1}{7}$
答案
$\frac{8}{11} × \frac{1}{5} \boxed{=} \frac{8}{11} ÷5$
$\frac{25}{28} × \frac{1}{4} \boxed{>} \frac{15}{28} ÷4$
$\frac{1}{8} ÷ \frac{10}{9} \boxed{<} \frac{1}{8} ÷ \frac{9}{10}$
$\frac{15}{22} × \frac{5}{11} \boxed{<} \frac{15}{22} ÷ \frac{25}{44}$
$\frac{5}{7} ×1.4 \boxed{=} 2.5 ÷ \frac{5}{2}$
$\frac{1}{2} ÷ \frac{1}{7} \boxed{<} \frac{4}{3} ÷ \frac{1}{7}$
$\frac{25}{28} × \frac{1}{4} \boxed{>} \frac{15}{28} ÷4$
$\frac{1}{8} ÷ \frac{10}{9} \boxed{<} \frac{1}{8} ÷ \frac{9}{10}$
$\frac{15}{22} × \frac{5}{11} \boxed{<} \frac{15}{22} ÷ \frac{25}{44}$
$\frac{5}{7} ×1.4 \boxed{=} 2.5 ÷ \frac{5}{2}$
$\frac{1}{2} ÷ \frac{1}{7} \boxed{<} \frac{4}{3} ÷ \frac{1}{7}$
3.接着算。

某班级中有18名男生,男生人数占全班总人数的$\frac{9}{20}$。转走了几名女生后,男生人数占全班总人数的$\frac{1}{2}$。这个班级转走了多少名女生?
反思 我错了()道题。
自我评价:
某班级中有18名男生,男生人数占全班总人数的$\frac{9}{20}$。转走了几名女生后,男生人数占全班总人数的$\frac{1}{2}$。这个班级转走了多少名女生?
反思 我错了()道题。
自我评价:
答案
第一行计算
$\frac{5}{8}-\frac{1}{2}=\frac{1}{8}$
$\frac{1}{8}÷\frac{5}{9}=\frac{9}{40}$
$\frac{9}{40}×\frac{5}{6}=\frac{3}{16}$
$\frac{3}{16}×\frac{2}{3}=\frac{1}{8}$
第二行计算
$\frac{3}{5}+\frac{2}{3}=\frac{19}{15}$
$\frac{19}{15}×\frac{5}{38}=\frac{1}{6}$
$\frac{1}{6}×\frac{3}{7}=\frac{1}{14}$
$\frac{1}{14}÷\frac{1}{2}=\frac{1}{7}$
应用题
$18÷\frac{9}{20}=40$(名)
$18÷\frac{1}{2}=36$(名)
$40-36=4$(名)
答:这个班级转走了4名女生。
$\frac{5}{8}-\frac{1}{2}=\frac{1}{8}$
$\frac{1}{8}÷\frac{5}{9}=\frac{9}{40}$
$\frac{9}{40}×\frac{5}{6}=\frac{3}{16}$
$\frac{3}{16}×\frac{2}{3}=\frac{1}{8}$
第二行计算
$\frac{3}{5}+\frac{2}{3}=\frac{19}{15}$
$\frac{19}{15}×\frac{5}{38}=\frac{1}{6}$
$\frac{1}{6}×\frac{3}{7}=\frac{1}{14}$
$\frac{1}{14}÷\frac{1}{2}=\frac{1}{7}$
应用题
$18÷\frac{9}{20}=40$(名)
$18÷\frac{1}{2}=36$(名)
$40-36=4$(名)
答:这个班级转走了4名女生。
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