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一、把下面各比化成最简整数比，并求出比值。
$\frac{25}{21}:15$
$\frac{1}{10}:0.4$
7.2千克：180克
$\frac{11}{25}:\frac{4}{5}$
$39:169$
1.2时：1时20分
$\frac{25}{21}:15$
$\frac{1}{10}:0.4$
7.2千克：180克
$\frac{11}{25}:\frac{4}{5}$
$39:169$
1.2时：1时20分
答案
1. $\frac{25}{21}:15$ 最简整数比为$5:63$，比值为$\frac{5}{63}$
2. $\frac{1}{10}:0.4$ 最简整数比为$1:4$，比值为$\frac{1}{4}$
3. 7.2千克：180克 最简整数比为$40:1$，比值为$40$
4. $\frac{11}{25}:\frac{4}{5}$ 最简整数比为$11:20$，比值为$\frac{11}{20}$
5. $39:169$ 最简整数比为$3:13$，比值为$\frac{3}{13}$
6. 1.2时：1时20分 最简整数比为$9:10$，比值为$\frac{9}{10}$
2. $\frac{1}{10}:0.4$ 最简整数比为$1:4$，比值为$\frac{1}{4}$
3. 7.2千克：180克 最简整数比为$40:1$，比值为$40$
4. $\frac{11}{25}:\frac{4}{5}$ 最简整数比为$11:20$，比值为$\frac{11}{20}$
5. $39:169$ 最简整数比为$3:13$，比值为$\frac{3}{13}$
6. 1.2时：1时20分 最简整数比为$9:10$，比值为$\frac{9}{10}$
二、根据比例的基本性质，在括号里填合适的数。
$(\ \ \ \ \ \ ):8=\frac{3}{4}:\frac{6}{5}$
$2.4:0.3=8:(\ \ \ \ \ \ )$
$(\ \ \ \ \ \ ):\frac{5}{14}=21:\frac{5}{8}$
$(\ \ \ \ \ \ ):\frac{1}{3}=6:5$
$9:0.2=(\ \ \ \ \ \ ):\frac{2}{3}$
$1.6:(\ \ \ \ \ \ )=\frac{8}{3}:\frac{2}{5}$
$0.4:\frac{5}{6}=24:(\ \ \ \ \ \ )$
$\frac{5}{4}:0.25=(\ \ \ \ \ \ ):\frac{4}{5}$
$\frac{2}{3}:(\ \ \ \ \ \ )=8:27$
$0.25:(\ \ \ \ \ \ )=5:6$
$8:0.4=6:(\ \ \ \ \ \ )$
$0.2:\frac{1}{2}=(\ \ \ \ \ \ ):4$
$1.2:(\ \ \ \ \ \ )=24:4.8$
$4:(\ \ \ \ \ \ )=\frac{4}{9}:2$
$1.8:2.5=0.9:(\ \ \ \ \ \ )$
$(\ \ \ \ \ \ ):8=\frac{3}{4}:\frac{6}{5}$
$2.4:0.3=8:(\ \ \ \ \ \ )$
$(\ \ \ \ \ \ ):\frac{5}{14}=21:\frac{5}{8}$
$(\ \ \ \ \ \ ):\frac{1}{3}=6:5$
$9:0.2=(\ \ \ \ \ \ ):\frac{2}{3}$
$1.6:(\ \ \ \ \ \ )=\frac{8}{3}:\frac{2}{5}$
$0.4:\frac{5}{6}=24:(\ \ \ \ \ \ )$
$\frac{5}{4}:0.25=(\ \ \ \ \ \ ):\frac{4}{5}$
$\frac{2}{3}:(\ \ \ \ \ \ )=8:27$
$0.25:(\ \ \ \ \ \ )=5:6$
$8:0.4=6:(\ \ \ \ \ \ )$
$0.2:\frac{1}{2}=(\ \ \ \ \ \ ):4$
$1.2:(\ \ \ \ \ \ )=24:4.8$
$4:(\ \ \ \ \ \ )=\frac{4}{9}:2$
$1.8:2.5=0.9:(\ \ \ \ \ \ )$
答案
1. $\boldsymbol{5}:8=\frac{3}{4}:\frac{6}{5}$
2. $2.4:0.3=8:\boldsymbol{1}$
3. $\boldsymbol{12}:\frac{5}{14}=21:\frac{5}{8}$
4. $\boldsymbol{\frac{2}{5}}:\frac{1}{3}=6:5$
5. $9:0.2=\boldsymbol{30}:\frac{2}{3}$
6. $1.6:\boldsymbol{\frac{6}{25}}=\frac{8}{3}:\frac{2}{5}$
7. $0.4:\frac{5}{6}=24:\boldsymbol{50}$
8. $\frac{5}{4}:0.25=\boldsymbol{4}:\frac{4}{5}$
9. $\frac{2}{3}:\boldsymbol{\frac{9}{4}}=8:27$
10. $0.25:\boldsymbol{0.3}=5:6$
11. $8:0.4=6:\boldsymbol{0.3}$
12. $0.2:\frac{1}{2}=\boldsymbol{1.6}:4$
13. $1.2:\boldsymbol{0.24}=24:4.8$
14. $4:\boldsymbol{18}=\frac{4}{9}:2$
15. $1.8:2.5=0.9:\boldsymbol{1.25}$
2. $2.4:0.3=8:\boldsymbol{1}$
3. $\boldsymbol{12}:\frac{5}{14}=21:\frac{5}{8}$
4. $\boldsymbol{\frac{2}{5}}:\frac{1}{3}=6:5$
5. $9:0.2=\boldsymbol{30}:\frac{2}{3}$
6. $1.6:\boldsymbol{\frac{6}{25}}=\frac{8}{3}:\frac{2}{5}$
7. $0.4:\frac{5}{6}=24:\boldsymbol{50}$
8. $\frac{5}{4}:0.25=\boldsymbol{4}:\frac{4}{5}$
9. $\frac{2}{3}:\boldsymbol{\frac{9}{4}}=8:27$
10. $0.25:\boldsymbol{0.3}=5:6$
11. $8:0.4=6:\boldsymbol{0.3}$
12. $0.2:\frac{1}{2}=\boldsymbol{1.6}:4$
13. $1.2:\boldsymbol{0.24}=24:4.8$
14. $4:\boldsymbol{18}=\frac{4}{9}:2$
15. $1.8:2.5=0.9:\boldsymbol{1.25}$
三、计算下面各题，能简算的要简算。
$\frac{5}{6}×(\frac{2}{9}÷\frac{5}{6}+\frac{5}{6})$
$21÷(\frac{1}{3}+\frac{2}{5})÷\frac{9}{11}$
$\frac{1}{8}÷(1-0.5-\frac{1}{4})$
$(\frac{19}{20}-\frac{1}{4})÷\frac{5}{12}$
$\frac{7}{8}×0.8+0.2×\frac{1}{8}$
$(3.8-7.7÷2.5)×2.5$
$2.12-(1.12+3×0.33)$
$147×4.3-4.6×43-4.3$
$\frac{5}{6}×(\frac{2}{9}÷\frac{5}{6}+\frac{5}{6})$
$21÷(\frac{1}{3}+\frac{2}{5})÷\frac{9}{11}$
$\frac{1}{8}÷(1-0.5-\frac{1}{4})$
$(\frac{19}{20}-\frac{1}{4})÷\frac{5}{12}$
$\frac{7}{8}×0.8+0.2×\frac{1}{8}$
$(3.8-7.7÷2.5)×2.5$
$2.12-(1.12+3×0.33)$
$147×4.3-4.6×43-4.3$
答案
1. $\frac{5}{6}×(\frac{2}{9}÷\frac{5}{6}+\frac{5}{6})=\frac{11}{12}$
2. $21÷(\frac{1}{3}+\frac{2}{5})÷\frac{9}{11}=35$
3. $\frac{1}{8}÷(1-0.5-\frac{1}{4})=\frac{1}{2}$
4. $(\frac{19}{20}-\frac{1}{4})÷\frac{5}{12}=\frac{42}{25}$
5. $\frac{7}{8}×0.8+0.2×\frac{1}{8}=\frac{29}{40}$
6. $(3.8-7.7÷2.5)×2.5=1.8$
7. $2.12-(1.12+3×0.33)=0.01$
8. $147×4.3-4.6×43-4.3=430$
2. $21÷(\frac{1}{3}+\frac{2}{5})÷\frac{9}{11}=35$
3. $\frac{1}{8}÷(1-0.5-\frac{1}{4})=\frac{1}{2}$
4. $(\frac{19}{20}-\frac{1}{4})÷\frac{5}{12}=\frac{42}{25}$
5. $\frac{7}{8}×0.8+0.2×\frac{1}{8}=\frac{29}{40}$
6. $(3.8-7.7÷2.5)×2.5=1.8$
7. $2.12-(1.12+3×0.33)=0.01$
8. $147×4.3-4.6×43-4.3=430$
