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1. 直接写出得数。(6分)
$9 9 9 + 1 1 1 =$ $0. 5 × 0. 0 2 =$ $3. 8 ÷ 0. 3 8 =$
$1. 2 4 + 0. 2 6 =$ $\frac {1}{7} - \frac {1}{8} =$ $\frac {2}{7} ÷ \frac {5}{1 4} =$
$\frac {1}{1 2} + \frac {2}{5} =$ $\frac {3}{8} × \frac {4}{5} =$ $8 - 4. 3 8 - 1. 6 2 =$
$0. 6 4 ÷ 8 \% =$ $2 4 ÷ \frac {2}{7} =$ $1 8 × \frac {1 1}{9} × \frac {1}{2} =$
$9 9 9 + 1 1 1 =$ $0. 5 × 0. 0 2 =$ $3. 8 ÷ 0. 3 8 =$
$1. 2 4 + 0. 2 6 =$ $\frac {1}{7} - \frac {1}{8} =$ $\frac {2}{7} ÷ \frac {5}{1 4} =$
$\frac {1}{1 2} + \frac {2}{5} =$ $\frac {3}{8} × \frac {4}{5} =$ $8 - 4. 3 8 - 1. 6 2 =$
$0. 6 4 ÷ 8 \% =$ $2 4 ÷ \frac {2}{7} =$ $1 8 × \frac {1 1}{9} × \frac {1}{2} =$
答案
1. 1110 0.01 10 1.5 $\frac{1}{56}$ $\frac{4}{5}$ $\frac{29}{60}$ $\frac{3}{10}$
2 8 84 11
2 8 84 11
2. 用竖式计算。(6分)
$4 5. 3 - 9. 7 2 = 0. 3 6 × 4. 8 =$ $1 7 6 ÷ 2 7 \approx$
(得数保留两位小数)
$4 5. 3 - 9. 7 2 = 0. 3 6 × 4. 8 =$ $1 7 6 ÷ 2 7 \approx$
(得数保留两位小数)
答案
2. 35.58 1.728 6.52
竖式略
竖式略
3. 计算下面各题，能简算的要简算。(18分)
$1 2. 5 × 8. 8$
$3. 7 1 - 2. 3 6 + 1. 2 9 - 0. 6 4$ $\frac {2}{2 5} ÷ [ \frac {8}{9} × (\frac {1}{2} - \frac {1}{5}) ]$
$1 2. 5 × 8. 8$
$3. 7 1 - 2. 3 6 + 1. 2 9 - 0. 6 4$ $\frac {2}{2 5} ÷ [ \frac {8}{9} × (\frac {1}{2} - \frac {1}{5}) ]$
答案
3. 110 237 2 $\frac{3}{10}$ $\frac{7}{12}$ $2024\frac{2024}{2025}$
