2. 把下面各比化成最简整数比,并求出比值。(8分)
$\frac{6}{7}:0.75$ $2.25:\frac{5}{9}$ $\frac{4}{7}:\frac{9}{28}$ $\frac{4}{5}$小时:$20$分钟
$\frac{6}{7}:0.75$ $2.25:\frac{5}{9}$ $\frac{4}{7}:\frac{9}{28}$ $\frac{4}{5}$小时:$20$分钟
答案:
$2.8:7,\frac{8}{7} 81:20,\frac{81}{20} 16:9,\frac{16}{9} 12:5,\frac{12}{5}$
3. 计算下面各题,能简算的要简算。(12分)
$\frac{3}{4} ÷ \frac{5}{8} × \frac{7}{10}$ $4.8 × (\frac{2}{3} + \frac{1}{6} - \frac{3}{4})$ $\frac{4}{9} ÷ (\frac{1}{3} + \frac{4}{9})$
$\frac{11}{5} × 37\% + \frac{63}{100} ÷ \frac{5}{11}$ $(\frac{1}{3} + \frac{1}{4}) ÷ \frac{1}{2} + \frac{5}{6}$ $\frac{8}{9} ÷ [(\frac{2}{5} + \frac{1}{10}) × \frac{4}{3}]$
$\frac{3}{4} ÷ \frac{5}{8} × \frac{7}{10}$ $4.8 × (\frac{2}{3} + \frac{1}{6} - \frac{3}{4})$ $\frac{4}{9} ÷ (\frac{1}{3} + \frac{4}{9})$
$\frac{11}{5} × 37\% + \frac{63}{100} ÷ \frac{5}{11}$ $(\frac{1}{3} + \frac{1}{4}) ÷ \frac{1}{2} + \frac{5}{6}$ $\frac{8}{9} ÷ [(\frac{2}{5} + \frac{1}{10}) × \frac{4}{3}]$
答案:
$3.\frac{21}{25} 0.4 \frac{4}{7} \frac{11}{5} 2 \frac{4}{3}$
4. 解方程。(9分)
$20\% x ÷ \frac{1}{4} = 12$ $x - \frac{3}{4}x = \frac{5}{8}$ $\frac{4}{25} ÷ x = \frac{8}{15}$
$20\% x ÷ \frac{1}{4} = 12$ $x - \frac{3}{4}x = \frac{5}{8}$ $\frac{4}{25} ÷ x = \frac{8}{15}$
答案:
$4.x=15 x=\frac{5}{2} x=\frac{3}{10}$
1. 一辆轻便自行车的车轮外直径大约是$60cm$,若平均每分钟转$200$圈,小明家离学校大约是$3768m$,则他从学校骑车回家大约需要多少分钟? (4分)
答案:
1.10分钟
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