Răspuns :
a + b = 40
a - b = 10
_________
a=? , b=?
a |___| 10 |
→ 40
b |___|
1) 1 + 1 = 2 ( parti egale )
2) 40 - 10 = 30 ( 2 parti egale )
3) 30 : 2 = 15 ( b )
4) 15 + 10 = 25 ( a )
a - b = 10
_________
a=? , b=?
a |___| 10 |
→ 40
b |___|
1) 1 + 1 = 2 ( parti egale )
2) 40 - 10 = 30 ( 2 parti egale )
3) 30 : 2 = 15 ( b )
4) 15 + 10 = 25 ( a )