Question

Вычесли удобным способом 8+3+7 = 3+8+7+2 = 5+3+7 = 5+4+5+6 =

Answer 1

3+7+8= 18
8+2+7+3=20
3+7+5 = 15
5+5+6+4= 20

Answer 2

8+3+7=(3+7)=18
3+8+7+2=(3+7)+(8+2)=20
5+3+7=5+(3+7)=15
5+4+5+6=(5+5)+(4+6)=20

Answer 3

8+(3+7)=18