实践应用第1题答案
2 × 3 + 50
= 6 + 50
= 56
6 × 6 - 9
= 36 - 9
= 27
38 + 4 × 5
= 38 + 20
= 58
实践应用第2题答案
5 × 4 + 30
= 20 + 30
= 50
5 + 4 × 8
= 5 + 32
= 37
实践应用第3题答案
30 + 3 × 9
= 30 + 27
= 57
6 × 5 + 25
= 30 + 25
= 55
45 - 5 × 8
= 45 - 40
= 5
实践应用第4题答案
(1)15 + 3 × 9
= 15 + 27
= 42(元)
(2)100 - 7 × 4
= 100 - 28
= 72(元)
达标检测第1题答案
(1)5 × 4 + 16
(2)50 - 7 × 6
达标检测第2题答案
30 + 3 × 6
= 30 + 18
= 48
14 + 7 × 2
= 14 + 14
= 28
9 × 2 - 4
= 18 - 4
= 14
30 + 3 - 6
= 33 - 6
= 27
14 - 7 × 2
= 14 - 14
= 0
9 - 2 × 4
= 9 - 8
= 1
达标检测第3题答案
(1)3 × 3 + 4
= 9 + 4
= 13(元)
(2)8 + 5 × 5
= 8 + 25
= 33(元)
(3)50 - 4 × 8
= 50 - 32
= 18(元)