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3. 化简下列各比并求比值。
$4:\dfrac{2}{5}=(\ ):(\ )=(\ )$
$68\%:1=(\ ):(\ )=(\ )$
$\dfrac{3}{4}\mathrm{时}:20\mathrm{分}=(\ ):(\ )=(\ )$
$3.6\ \mathrm{m}:54\ \mathrm{dm}=(\ ):(\ )=(\ )$
$0.75:\dfrac{7}{8}=(\ ):(\ )=(\ )$
$\dfrac{3}{8}:\dfrac{15}{4}=(\ ):(\ )=(\ )$
$4:\dfrac{2}{5}=(\ ):(\ )=(\ )$
$68\%:1=(\ ):(\ )=(\ )$
$\dfrac{3}{4}\mathrm{时}:20\mathrm{分}=(\ ):(\ )=(\ )$
$3.6\ \mathrm{m}:54\ \mathrm{dm}=(\ ):(\ )=(\ )$
$0.75:\dfrac{7}{8}=(\ ):(\ )=(\ )$
$\dfrac{3}{8}:\dfrac{15}{4}=(\ ):(\ )=(\ )$
答案
3. $10:1$ $10$
$17:25$ $\frac{17}{25}$
$9:4$ $\frac{9}{4}$
$2:3$ $\frac{2}{3}$
$6:7$ $\frac{6}{7}$
$1:10$ $\frac{1}{10}$
$17:25$ $\frac{17}{25}$
$9:4$ $\frac{9}{4}$
$2:3$ $\frac{2}{3}$
$6:7$ $\frac{6}{7}$
$1:10$ $\frac{1}{10}$
4. 算一算，填一填。
40% $\xrightarrow{× 3}$ $□$ $\xrightarrow{× 10\%}$ $□$ $\xrightarrow{÷ 20\%}$ $□$ $\xrightarrow{÷ 25\%}$ $□$ $\xrightarrow{× 40\%}$ $□$
20% $\xrightarrow{× 25}$ $□$ $\xrightarrow{× 40\%}$ $□$ $\xrightarrow{÷ 80\%}$ $□$ $\xrightarrow{× 16\%}$ $□$ $\xrightarrow{× \frac{5}{8}}$ $□$
40% $\xrightarrow{× 3}$ $□$ $\xrightarrow{× 10\%}$ $□$ $\xrightarrow{÷ 20\%}$ $□$ $\xrightarrow{÷ 25\%}$ $□$ $\xrightarrow{× 40\%}$ $□$
20% $\xrightarrow{× 25}$ $□$ $\xrightarrow{× 40\%}$ $□$ $\xrightarrow{÷ 80\%}$ $□$ $\xrightarrow{× 16\%}$ $□$ $\xrightarrow{× \frac{5}{8}}$ $□$
答案
4. $1.2$ $0.12$ $0.6$ $2.4$ $0.96$
$5$ $2$ $2.5$ $0.4$ $0.25$
$5$ $2$ $2.5$ $0.4$ $0.25$
5. 在 ○ 里填上“＞”“＜”或“=”。
90%−15% ○ 85%
850×40% ○ 300
50×(1+10%) ○ 50
10+1×36% ○ 36×1.2
85%−22% ○ 45%+12%
30×(1+15%) ○ 45
90%−15% ○ 85%
850×40% ○ 300
50×(1+10%) ○ 50
10+1×36% ○ 36×1.2
85%−22% ○ 45%+12%
30×(1+15%) ○ 45
答案
5. $＜$ $＞$ $＞$ $＜$ $＞$ $＜$
6. 看图列式计算。
答案
6. $740×75\%=555(\mathrm{只})$
$600 × ( 1 - 20\% - 30\% ) = 300(\mathrm{m})$
$600 × ( 1 - 20\% - 30\% ) = 300(\mathrm{m})$
计算:$\frac{3}{5}×\frac{4}{6}×\frac{5}{7}×\frac{6}{8}×\frac{7}{9}×\frac{8}{10}×…×\frac{31}{33}×\frac{32}{34}×\frac{33}{35}×\frac{34}{36}$
答案
【思维提升】$\frac{1}{105}$
