24点题目：使用数字 4 6 9 9，利用加减乘除、括号算出24。数字顺序可以任意调换，下面列出所有可行算式。
本题共有45个解（使用交换律变换后算一个解）,
难度系数是1星
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最简单入门24点题目
】。
| 序号 |
题目：4,6,9,9 |
| 1 |
((6 × 4) − 9) + 9 |
| 2 |
((6 × 4) + 9) − 9 |
| 3 |
((9 + 6) − 9) × 4 |
| 4 |
(9 − (9 − 6)) × 4 |
| 5 |
(6 + (9 − 9)) × 4 |
| 6 |
(6 − (9 − 9)) × 4 |
| 7 |
(6 × 4) + (9 − 9) |
| 8 |
(6 × 4) − (9 − 9) |
| 9 |
6 × (4 + (9 − 9)) |
| 10 |
6 × (9 − (9 − 4)) |
| 11 |
6 × ((9 + 4) − 9) |
| 12 |
6 × (4 − (9 − 9)) |
| 13 |
((6 × 4) × 9) ÷ 9 |
| 14 |
((9 × 6) × 4) ÷ 9 |
| 15 |
((9 × 4) × 6) ÷ 9 |
| 16 |
((9 × 6) ÷ 9) × 4 |
| 17 |
(6 ÷ (9 ÷ 9)) × 4 |
| 18 |
(6 × 4) × (9 ÷ 9) |
| 19 |
(6 × (9 ÷ 9)) × 4 |
| 20 |
(6 × 4) ÷ (9 ÷ 9) |
| 21 |
6 × ((9 × 4) ÷ 9) |
| 22 |
6 × (4 ÷ (9 ÷ 9)) |
| 23 |
6 × (4 × (9 ÷ 9)) |
| 24 |
(9 × 4) ÷ (9 ÷ 6) |
| 25 |
(9 × 4) × (6 ÷ 9) |
| 26 |
(9 × 6) ÷ (9 ÷ 4) |
| 27 |
(9 ÷ (9 ÷ 6)) × 4 |
| 28 |
(9 × 6) × (4 ÷ 9) |
| 29 |
(9 × (6 ÷ 9)) × 4 |
| 30 |
6 ÷ (9 ÷ (9 × 4)) |
| 31 |
4 ÷ ((9 ÷ 9) ÷ 6) |
| 32 |
9 × (6 ÷ (9 ÷ 4)) |
| 33 |
9 × (4 ÷ (9 ÷ 6)) |
| 34 |
9 ÷ ((9 ÷ 4) ÷ 6) |
| 35 |
9 × (6 × (4 ÷ 9)) |
| 36 |
4 ÷ ((9 ÷ 6) ÷ 9) |
| 37 |
6 × (9 × (4 ÷ 9)) |
| 38 |
9 ÷ ((9 ÷ 6) ÷ 4) |
| 39 |
6 ÷ ((9 ÷ 9) ÷ 4) |
| 40 |
9 × (4 × (6 ÷ 9)) |
| 41 |
6 ÷ ((9 ÷ 4) ÷ 9) |
| 42 |
4 ÷ (9 ÷ (9 × 6)) |
| 43 |
9 ÷ (9 ÷ (6 × 4)) |
| 44 |
6 × (9 ÷ (9 ÷ 4)) |
| 45 |
9 × ((6 × 4) ÷ 9) |