Sagot :
Answer:
1.8
2.56
3.39
4.22
5.39
Step-by-step explanation:
1. (12+3)-7=N
12+3=15
15-7=8
2. 4(6+8)=N
6+8=14
4(14)=56
3. 25+5+9=N
25+5=30
30+9=39
4. (18-4)+(5+3)=N
18-4=14
14+(5+3)=N
5+3=8
14+8=22
5. (6+3)+(10×3)=N
10×3=30
(6+3)+30=N
6+3=9
30+9=39