随机大全随机生成5、10、20、50、100以内加减乘除题目
选择四则运算符号和难度系数
生成的题目如下：
| 5 + 0 = | 2 + 1 = | 5 + 0 = |
| 1 + 4 = | 2 + 2 = | 2 + 2 = |
| 5 + 0 = | 4 + 1 = | 1 + 3 = |
| 4 + 1 = | 1 + 2 = | 1 + 3 = |
| 4 + 0 = | 2 + 2 = | 3 + 1 = |
| 1 + 1 = | 4 + 1 = | 2 + 1 = |
| 3 + 1 = | 1 + 2 = | 3 + 2 = |
| 1 + 2 = | 1 + 3 = | 4 + 1 = |
| 3 + 1 = | 2 + 2 = | 1 + 3 = |
| 5 + 0 = | 3 + 2 = | 4 + 1 = |
| 5 + 0 = | 1 + 2 = | 2 + 1 = |
| 4 + 1 = | 3 + 1 = | 1 + 3 = |
| 1 + 2 = | 3 + 1 = | 1 + 1 = |
| 2 + 3 = | 5 + 0 = | 2 + 2 = |
| 3 + 1 = | 2 + 2 = | 5 + 0 = |
| 1 + 3 = | 2 + 3 = | 2 + 1 = |
| 5 + 0 = | 4 + 1 = | 3 + 2 = |
| 2 + 1 = | 4 + 1 = | 4 + 1 = |
| 4 + 1 = | 2 + 2 = | 5 + 0 = |
| 1 + 4 = | 5 + 0 = | 1 + 2 = |