《2025年口算训练六年级数学上册人教版双色升级版》

$\frac { 6 } { 7 } ÷ \frac { 3 } { 2 8 } =$8 $\frac { 6 } { 7 } ÷ \frac { 2 } { 7 } =$3 $\frac { 4 } { 2 1 } ÷ \frac { 2 } { 3 } =$$\frac{2}{7}$ $\frac { 2 } { 9 } ÷ \frac { 1 } { 3 } =$$\frac{2}{3}$ $\frac { 5 } { 9 } ÷ \frac { 2 } { 3 } =$$\frac{5}{6}$ $1 4 ÷ \frac { 7 } { 1 1 } =$22 $\frac { 3 } { 5 } ÷ 6 =$$\frac{1}{10}$ $\frac { 4 } { 1 5 } ÷ \frac { 2 } { 5 } =$$\frac{2}{3}$ $1 2 ÷ \frac { 2 4 } { 2 5 } =$$\frac{25}{2}$ $\frac { 4 } { 5 } ÷ 4 =$$\frac{1}{5}$ $\frac { 8 } { 1 1 } ÷ 1 6 =$$\frac{1}{22}$ $1 5 ÷ \frac { 5 } { 1 8 } =$54 $\frac { 7 } { 9 } ÷ \frac { 3 } { 7 } =$$\frac{49}{27}$

答案： 解析：题目考查的是分数的除法运算。分数除法的关键是将除法转换为乘法，即“除以一个数等于乘以这个数的倒数”。
答案：
$\frac{6}{7} ÷ \frac{3}{28} = \frac{6}{7} × \frac{28}{3} = 8$
$\frac{6}{7} ÷ \frac{2}{7} = \frac{6}{7} × \frac{7}{2} = 3$
$\frac{4}{21} ÷ \frac{2}{3} = \frac{4}{21} × \frac{3}{2} = \frac{2}{7}$
$\frac{2}{9} ÷ \frac{1}{3} = \frac{2}{9} × 3 = \frac{2}{3}$
$\frac{5}{9} ÷ \frac{2}{3} = \frac{5}{9} × \frac{3}{2} = \frac{5}{6}$
$14 ÷ \frac{7}{11} = 14 × \frac{11}{7} = 22$
$\frac{3}{5} ÷ 6 = \frac{3}{5} × \frac{1}{6} = \frac{1}{10}$
$\frac{4}{15} ÷ \frac{2}{5} = \frac{4}{15} × \frac{5}{2} = \frac{2}{3}$
$12 ÷ \frac{24}{25} = 12 × \frac{25}{24} = \frac{25}{2}$
$\frac{4}{5} ÷ 4 = \frac{4}{5} × \frac{1}{4} = \frac{1}{5}$
$\frac{8}{11} ÷ 16 = \frac{8}{11} × \frac{1}{16} = \frac{1}{22}$
$15 ÷ \frac{5}{18} = 15 × \frac{18}{5} = 54$
$\frac{7}{9} ÷ \frac{3}{7} = \frac{7}{9} × \frac{7}{3} = \frac{49}{27}$

化简。
$ 2 : 8 = $
$ 8 : 2 = $
$ 4 : 2 4 = $
$ 2 4 : 4 = $
$ 9 : 1 5 = $
$ 1 5 : 9 = $
$ 3 6 : 2 0 = $
$ 2 0 : 3 6 = $
$ 3 2 : 8 = $
$ 8 : 3 2 = $
$ \frac { 9 0 } { 1 5 } = $
$ \frac { 2 5 } { 7 0 } = $
$ \frac { 4 5 } { 2 5 } = $
$ \frac { 1 } { 2 } : \frac { 5 } { 7 } = $
$ \frac { 1 } { 3 } : 0. 2 5 = $
$ \frac { 1 } { 4 } : \frac { 4 } { 1 5 } = $
$ \frac { 2 } { 5 } : 0. 8 = $

答案： $2:8=1:4$
$8:2=4:1$
$4:24=1:6$
$24:4=6:1$
$9:15=3:5$
$15:9=5:3$
$36:20=9:5$
$20:36=5:9$
$32:8=4:1$
$8:32=1:4$
$\frac{90}{15}=6$
$\frac{25}{70}=\frac{5}{14}$
$\frac{45}{25}=\frac{9}{5}$
$\frac{1}{2}:\frac{5}{7}=7:10$
$\frac{1}{3}:0.25=4:3$
$\frac{1}{4}:\frac{4}{15}=15:16$
$\frac{2}{5}:0.8=1:2$

化简。
$ 0. 2 : 1. 4 = $$1:7$
$ 1. 4 : 0. 2 = $$7:1$
$ 1. 2 : 0. 6 = $$2:1$
$ 0. 6 : 1. 2 = $$1:2$
$ 0. 8 : 4. 8 = $$1:6$
$ 4. 8 : 0. 8 = $$6:1$
$ 0. 7 2 : 0. 9 = $$4:5$
$ 0. 9 : 0. 7 2 = $$5:4$
$ 0. 7 : 0. 3 5 = $$2:1$
$ 0. 3 5 : 0. 7 = $$1:2$
$ \frac { 1 0 } { 2 5 } = $$\frac{2}{5}$
$ \frac { 2 } { 3 8 } = $$\frac{1}{19}$
$ \frac { 0. 9 } { 0. 0 3 } = $$30$
$ 0. 2 5 : 1. 2 5 = $$1:5$
$ \frac { 1 } { 4 } : \frac { 1 } { 3 } = $$3:4$
$ \frac { 1 } { 5 } : \frac { 1 } { 6 } = $$6:5$
$ \frac { 4. 2 } { 1. 6 8 } = $$\frac{5}{2}$

答案： $0.2:1.4=1:7$
$1.4:0.2=7:1$
$1.2:0.6=2:1$
$0.6:1.2=1:2$
$0.8:4.8=1:6$
$4.8:0.8=6:1$
$0.72:0.9=4:5$
$0.9:0.72=5:4$
$0.7:0.35=2:1$
$0.35:0.7=1:2$
$\frac{10}{25}=\frac{2}{5}$
$\frac{2}{38}=\frac{1}{19}$
$\frac{0.9}{0.03}=30$
$0.25:1.25=1:5$
$\frac{1}{4}:\frac{1}{3}=3:4$
$\frac{1}{5}:\frac{1}{6}=6:5$
$\frac{4.2}{1.68}=\frac{5}{2}$