Răspuns :
(42+43+44+...+87)-(37+38+39+...+82
)=
=42+43+44+...+87
- 37-38-39+...-82 82-36=46 de termeni
______________ =5*46= 230
5 +5 +5 +5....+5
=42+43+44+...+87
- 37-38-39+...-82 82-36=46 de termeni
______________ =5*46= 230
5 +5 +5 +5....+5