初二数学练习题50道带答案

初二数学练习题50道带答案

1. 计算下列各式的值：

a) 5 + 3 × 2 - 6 ÷ 3

b) 4 × 2 + 6 ÷ 3 - 2

c) 8 + 4 × 3 - 2 ÷ 2

答案：

a) 5 + 3 × 2 - 6 ÷ 3 = 5 + 6 - 2 = 9

b) 4 × 2 + 6 ÷ 3 - 2 = 8 + 2 - 2 = 8

c) 8 + 4 × 3 - 2 ÷ 2 = 8 + 12 - 1 = 19

2. 求下列各式的值：

a) 13 + 4 × (7 - 3)

b) 15 - 2 × (4 + 6)

c) 6 × (9 - 3) + 12 ÷ 4

答案：

a) 13 + 4 × (7 - 3) = 13 + 4 × 4 = 13 + 16 = 29

b) 15 - 2 × (4 + 6) = 15 - 2 × 10 = 15 - 20 = -5

c) 6 × (9 - 3) + 12 ÷ 4 = 6 × 6 + 12 ÷ 4 = 36 + 3 = 39

3. 计算下列各题：

a) 98 - 23 - 17

b) 65 + 27 + 48

c) 78 × 5 - 56 ÷ 7

答案：

a) 98 - 23 - 17 = 58

b) 65 + 27 + 48 = 140

c) 78 × 5 - 56 ÷ 7 = 390 - 8 = 382

4. 求下列各题：

a) 34 + 58 - 29

b) 87 - 42 + 15

c) 25 + 36 - 18

答案：

a) 34 + 58 - 29 = 63

b) 87 - 42 + 15 = 60

c) 25 + 36 - 18 = 43

5. 计算下列各题：

a) (12 + 7) × 5

b) 11 × (25 - 16)

c) 48 ÷ (8 + 4)

答案：

a) (12 + 7) × 5 = 19 × 5 = 95

b) 11 × (25 - 16) = 11 × 9 = 99

c) 48 ÷ (8 + 4) = 48 ÷ 12 = 4

6. 求下列各题：

a) 15 ÷ (10 - 8)

b) (5 + 3) × (6 - 2)

c) 24 ÷ (9 + 3)

答案：

a) 15 ÷ (10 - 8) = 15 ÷ 2 = 7.5

b) (5 + 3) × (6 - 2) = 8 × 4 = 32

c) 24 ÷ (9 + 3) = 24 ÷ 12 = 2

7. 计算下列各题：

a) 20 ÷ (5 - 1)

b) (8 + 4) × 3

c) 45 ÷ (9 - 3)

答案：

a) 20 ÷ (5 - 1) = 20 ÷ 4 = 5

b) (8 + 4) × 3 = 12 × 3 = 36

c) 45 ÷ (9 - 3) = 45 ÷ 6 = 7.5

8. 求下列各题：

a) (20 + 13) ÷ 11

b) 18 - 2 × (6 - 3)

c) (9 + 6) ÷ (2 + 2)

答案：

a) (20 + 13) ÷ 11 = 33 ÷ 11 = 3

b) 18 - 2 × (6 - 3) = 18 - 2 × 3 = 18 - 6 = 12

c) (9 + 6) ÷ (2 + 2) = 15 ÷ 4 = 3.75

9. 计算下列各题：

a) 48 ÷ (9 - 4)

b) (12 - 6) × 2

c) (15 + 9) ÷ (5 + 2)

答案：

a) 48 ÷ (9 - 4) = 48 ÷ 5 = 9.6

b) (12 - 6) × 2 = 6 × 2 = 12

c) (15 + 9) ÷ (5 + 2) = 24 ÷ 7 = 3.43

10. 求下列各题：

a) 18 ÷ (6 - 2)

b) (8 + 4) × (6 - 3)

c) 24 ÷ (9 + 3)

答案：

a) 18 ÷ (6 - 2) = 18 ÷ 4 = 4.5

b) (8 + 4) × (6 - 3) = 12 × 3 = 36

c) 24 ÷ (9 + 3) = 24 ÷ 12 = 2

11. 计算下列各题：

a) (15 - 10) ÷ 5

b) 35 - 5 × (8 - 2)

c) (48 + 24) ÷ (8 + 4)

答案：

a) (15 - 10) ÷ 5 = 5 ÷ 5 = 1

b) 35 - 5 × (8 - 2) = 35 - 5 × 6 = 35 - 30 = 5

c) (48 + 24) ÷ (8 + 4) = 72 ÷ 12 = 6

12. 求下列各题：

a) 17 + (8 - 5) × 6

b) 62 - 4 × (7 + 2)

c) (12 + 6) ÷ (3 + 3)

答案：

a) 17 + (8 - 5) × 6 = 17 + 3 × 6 = 17 + 18 = 35

b) 62 - 4 × (7 + 2) = 62 - 4 × 9 = 62 - 36 = 26

c) (12 + 6) ÷ (3 + 3) = 18 ÷ 6 = 3

13. 计算下列各题：

a) 48 ÷ (8 - 4) × 2

b) (15 - 5) × 3 + 9

c) 20 - 4 × (8 ÷ 4)

答案：

a) 48 ÷ (8 - 4) × 2 = 48 ÷ 4 × 2 = 12 × 2 = 24

b) (15 - 5) × 3 + 9 = 10 × 3 + 9 = 30 + 9 = 39

c) 20 - 4 × (8 ÷ 4) = 20 - 4 × 2 = 20 - 8 = 12

14. 求下列各题：

a) (12 + 8) × (7 - 2)

b) 45 ÷ (9 - 4) + 6

c) 28 - 4 × (9 ÷ 3)

答案：

a) (12 + 8) × (7 - 2) = 20 × 5 = 100

b) 45 ÷ (9 - 4) + 6 = 45 ÷ 5 + 6 = 9 + 6 = 15

c) 28 - 4 × (9 ÷ 3) = 28 - 4 × 3 = 28 - 12 = 16