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1. 单位换算。
$2\frac{1}{6}$时=(
3.5时=(
138分=(
5时50分=(
$2\frac{1}{6}$时=(
130
)分3.5时=(
210
)分138分=(
2.3
)时5时50分=(
$5\frac{5}{6}$
)时答案
1. 130 210 2.3 $5\frac{5}{6}$
2. (
27是(
25是(
$\frac{4}{9}$是$\frac{7}{12}$的(
30
)的$\frac{5}{6}$是2527是(
30
)的$\frac{9}{10}$25是(
40
)的$\frac{5}{8}$$\frac{4}{9}$是$\frac{7}{12}$的(
$\frac{16}{21}$
)答案
2. 30 30 40 $\frac{16}{21}$
3. 小车$\frac{4}{3}$小时行驶80千米，行驶1千米需要(
$\frac{1}{60}$
)小时，1小时汽车能行驶(60
)千米。答案
3. $\frac{1}{60}$ 60
4. 修建一条长$40\dfrac{1}{2}$千米的路，9天能修完，平均每天修(
$\frac{9}{2}$
)千米，每天能修这条路的($\frac{1}{9}$
)。答案
4. $\frac{9}{2}$ $\frac{1}{9}$
二、算一算
$( \dfrac{5}{6} + \dfrac{4}{5} ) × 30$
$\dfrac{7}{9} + \dfrac{2}{9} × \dfrac{9}{7}$
$\dfrac{13}{42} ÷ 1\dfrac{6}{7}$
$35 ÷ \dfrac{7}{12}$
$\dfrac{17}{18} ÷ \dfrac{2}{3} - \dfrac{1}{4}$
$\dfrac{5}{8} - \dfrac{5}{8} × \dfrac{4}{5}$
$( \dfrac{5}{6} + \dfrac{4}{5} ) × 30$
$\dfrac{7}{9} + \dfrac{2}{9} × \dfrac{9}{7}$
$\dfrac{13}{42} ÷ 1\dfrac{6}{7}$
$35 ÷ \dfrac{7}{12}$
$\dfrac{17}{18} ÷ \dfrac{2}{3} - \dfrac{1}{4}$
$\dfrac{5}{8} - \dfrac{5}{8} × \dfrac{4}{5}$
答案
$( \dfrac{5}{6} + \dfrac{4}{5} ) × 30=49$
$\dfrac{7}{9} + \dfrac{2}{9} × \dfrac{9}{7}=\dfrac{67}{63}$
$\dfrac{13}{42} ÷ 1\dfrac{6}{7}=\dfrac{1}{6}$
$35 ÷ \dfrac{7}{12}=60$
$\dfrac{17}{18} ÷ \dfrac{2}{3} - \dfrac{1}{4}=\dfrac{7}{6}$
$\dfrac{5}{8} - \dfrac{5}{8} × \dfrac{4}{5}=\dfrac{1}{8}$
$\dfrac{7}{9} + \dfrac{2}{9} × \dfrac{9}{7}=\dfrac{67}{63}$
$\dfrac{13}{42} ÷ 1\dfrac{6}{7}=\dfrac{1}{6}$
$35 ÷ \dfrac{7}{12}=60$
$\dfrac{17}{18} ÷ \dfrac{2}{3} - \dfrac{1}{4}=\dfrac{7}{6}$
$\dfrac{5}{8} - \dfrac{5}{8} × \dfrac{4}{5}=\dfrac{1}{8}$
三、解方程
$\frac{3}{4}x - \frac{1}{4} = \frac{2}{5}$
$x ÷ \frac{1}{5} = 25$
$x - \frac{1}{8}x = 1.75$
$\frac{3}{4}x - \frac{1}{4} = \frac{2}{5}$
$x ÷ \frac{1}{5} = 25$
$x - \frac{1}{8}x = 1.75$
答案
$\frac{3}{4}x - \frac{1}{4} = \frac{2}{5}$，$x=\frac{13}{15}$
$x ÷ \frac{1}{5} = 25$，$x=5$
$x - \frac{1}{8}x = 1.75$，$x=2$
$x ÷ \frac{1}{5} = 25$，$x=5$
$x - \frac{1}{8}x = 1.75$，$x=2$
