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1. 直接写出得数。(5分)
$6 ÷ \frac {3}{4} = 1 ÷ 10 \% = 9 - 0. 9 = 1. 6 × 0. 1 2 5 =$
$\frac {1}{2} - \frac {1}{3} =$ $\frac {2}{3} ÷ \frac {3}{2} =$ $0. 1 ^ {2} =$ $1 - \frac {2}{5} + \frac {3}{5} =$
$(\frac {1}{4} - \frac {1}{5}) × 2 0 =$ $\frac {1}{3} × \frac {1}{4} ÷ \frac {1}{3} × \frac {1}{4} =$
$6 ÷ \frac {3}{4} = 1 ÷ 10 \% = 9 - 0. 9 = 1. 6 × 0. 1 2 5 =$
$\frac {1}{2} - \frac {1}{3} =$ $\frac {2}{3} ÷ \frac {3}{2} =$ $0. 1 ^ {2} =$ $1 - \frac {2}{5} + \frac {3}{5} =$
$(\frac {1}{4} - \frac {1}{5}) × 2 0 =$ $\frac {1}{3} × \frac {1}{4} ÷ \frac {1}{3} × \frac {1}{4} =$
答案
1. 8 10 8.1 0.2 $\frac{1}{6}$ $\frac{4}{9}$ 0.01 $1\frac{1}{5}$(或$\frac{6}{5}$)
1 $\frac{1}{16}$
1 $\frac{1}{16}$
2. 计算下面各题，能简算的要简算。(9分)
答案
2. $\frac{9}{10}$ $1\frac{8}{11}$(或$\frac{19}{11}$) $\frac{1}{12}$
3. 解方程或解比例。(12分)
$\frac {x}{2 . 5} = \frac {1 2}{7 5}$ $x: 8 = \frac {1}{1 6}: \frac {1}{8}$ $1 0 + 7 5 \% x = 1 4. 5$
$7: x = 1 4: 2 6$ $1. 8: 2.$ $4 = \frac {x}{4 . 5}$ $\frac {3}{5}: x = \frac {2}{7}: 1 0$
$\frac {x}{2 . 5} = \frac {1 2}{7 5}$ $x: 8 = \frac {1}{1 6}: \frac {1}{8}$ $1 0 + 7 5 \% x = 1 4. 5$
$7: x = 1 4: 2 6$ $1. 8: 2.$ $4 = \frac {x}{4 . 5}$ $\frac {3}{5}: x = \frac {2}{7}: 1 0$
答案
3. $x=0.4$
$x=4$ $x=6$ $x=13$ $x=3.375$ $x=21$
$x=4$ $x=6$ $x=13$ $x=3.375$ $x=21$
二、填空题。(每空1分，共24分)
1. $ \frac{4}{5}=20: $ ( )=( )：20=( )(填小数)
1. $ \frac{4}{5}=20: $ ( )=( )：20=( )(填小数)
答案
1. 25 16 0.8
2. 如果 $ \frac{9}{m}=\frac{10}{n} $ ，那么 m $ × $ ( )=n $ × $ ( )；如果 5x=8y，
那么 x：y=( ：)。
那么 x：y=( ：)。
答案
2. 10 9 $8:5$(前两空答案不唯一)
