北师大版三年级上册数学一混合运算小熊购物两导两练高效学案答案
1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
2实践应用第2题答案
5 × 4 + 30
= 20 + 30
= 50
5 + 4 × 8
= 5 + 32
= 37
3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
4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)
5达标检测第1题答案
(1)5 × 4 + 16
(2)50 - 7 × 6
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
7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)