北师大版三年级上册数学一混合运算过河两导两练高效学案详细解答过程和答案
实践应用第1题详细解答过程和答案38 - (8 + 30)
= 38 - 38
= 0
5×(18 - 12)
= 5 × 6
= 30
(45 - 10) ÷ 5
= 35 ÷ 5
= 7
实践应用第2题详细解答过程和答案
16 + 24 ÷ 8
= 16 + 3
= 19
(16 + 24) ÷ 8
= 40 ÷ 8
= 5
18 - 9 × 2
= 18 - 18
= 0
(18 - 9) × 2
= 9 × 2
= 18
实践应用第3题详细解答过程和答案
34 + 8 × 2
= 34 + 16
= 50(人)
达标检测第1题详细解答过程和答案
前两道题不对。
12 + 12 ÷ 6
= 12 + 2
= 14
42 - (22 - 9)
= 42 - 13
= 29
达标检测第2题详细解答过程和答案
63 ÷ (36 - 29)
= 63 ÷ 7
= 9
99 - (46 + 34)
= 99 - 80
= 19
(110 - 80) ÷ 5
= 30 ÷ 5
= 6
达标检测第3题详细解答过程和答案
100 - 9 × 5
= 100 - 45
= 55(只)
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