1. 直接写出得数。(9分)
$0. 9 × 0. 7 =$ $\frac {1}{2} ÷ \frac {5}{6} =$ $(\frac {1}{7} - \frac {1}{1 2}) × 7 =$
$0. 2 4 ÷ 0. 0 6 =$ $0. 5 ^ {2} + 0. 2 ^ {2} =$ $2 ÷ \frac {4}{9} × \frac {2}{3} =$
$8. 4 ÷ 1 2 \% =$ $1 2 5 × 0. 8 8 =$ $\frac {5}{7} + \frac {2}{7} - \frac {5}{7} + \frac {2}{7} =$
$0. 9 × 0. 7 =$ $\frac {1}{2} ÷ \frac {5}{6} =$ $(\frac {1}{7} - \frac {1}{1 2}) × 7 =$
$0. 2 4 ÷ 0. 0 6 =$ $0. 5 ^ {2} + 0. 2 ^ {2} =$ $2 ÷ \frac {4}{9} × \frac {2}{3} =$
$8. 4 ÷ 1 2 \% =$ $1 2 5 × 0. 8 8 =$ $\frac {5}{7} + \frac {2}{7} - \frac {5}{7} + \frac {2}{7} =$
答案
1. 0.63 $\frac{3}{5}$ $\frac{5}{12}$ 4 0.29 3 70 110 $\frac{4}{7}$
2. 计算下面各题,能简算的要简算。(8分)
$3. 6 × 5 5 + 4 5 × 3. 6$ $1 6 × (\frac {3}{1 6} - \frac {1}{4 5}) × 4 5$
$1. 7 5 ÷ (3. 5 - 0. 6 4 - 0. 3 6)$
$3. 6 × 5 5 + 4 5 × 3. 6$ $1 6 × (\frac {3}{1 6} - \frac {1}{4 5}) × 4 5$
$1. 7 5 ÷ (3. 5 - 0. 6 4 - 0. 3 6)$
答案
2. 360 119 0.7 $\frac{9}{2}$
3. 解方程或解比例。(9分)
$7. 5: x = \frac {9}{5}: 1 2$ $\frac {2}{3} x - 50 \% x = \frac {2}{5}$ $x: \frac {3}{5} = \frac {5}{6}: 1 0$
$7. 5: x = \frac {9}{5}: 1 2$ $\frac {2}{3} x - 50 \% x = \frac {2}{5}$ $x: \frac {3}{5} = \frac {5}{6}: 1 0$
答案
3. $x=50$ $x=\frac{12}{5}$ $x=\frac{1}{20}$
1. 聪聪面向南站立,然后向左转了 $ 5 0° $ ,现在他所面对的方向是( )偏( )( ) $ ° $ ;明明面向西站立,然后向右转了 $ 4 0° $ ,现在他所面对的方向是( )偏( ) $ ° $ 。
答案
1. 南 东 50 北 西 50
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