一、加法运算

1. 23 + 54 + 17 =

2. 72 + 34 + 18 =

3. 56 + 23 + 44 =

4. 123 + 45 + 67 =

5. 89 + 76 + 24 =

二、减法运算

1. 98 - 57 - 23 =

2. 76 - 45 - 18 =

3. 64 - 32 - 17 =

4. 456 - 234 - 67 =

5. 123 - 89 - 45 =

三、乘法运算

1. 3 × 5 × 7 =

2. 9 × 6 × 4 =

3. 12 × 8 × 5 =

4. 24 × 3 × 6 =

5. 45 × 2 × 8 =

四、除法运算

1. 28 ÷ 4 ÷ 3 =

2. 36 ÷ 9 ÷ 2 =

3. 567 ÷ 3 ÷ 7 =

4. 648 ÷ 6 ÷ 4 =

5. 900 ÷ 5 ÷ 6 =