Răspuns :
Le transformam in ecuatie
[tex]a+b=27[/tex] }+
[tex]a-b=7[/tex]
------------------------
2b=34
b=17
a+b=27
a+17=27
a=10
[tex]a+b=27[/tex] }+
[tex]a-b=7[/tex]
------------------------
2b=34
b=17
a+b=27
a+17=27
a=10
a+b = 27
a - b = 7
-------------------
a = ? b =?
a |-----|+7|
b |-----| } 27.
27 - 7 = 20 ( 2 segmente egale)
20 : 2 = 10 (b)
10 + 7 = 17 (a)
Proba : 17 + 10 = 27 ( a+b)
17 - 10 = 7 ( a - b).
a - b = 7
-------------------
a = ? b =?
a |-----|+7|
b |-----| } 27.
27 - 7 = 20 ( 2 segmente egale)
20 : 2 = 10 (b)
10 + 7 = 17 (a)
Proba : 17 + 10 = 27 ( a+b)
17 - 10 = 7 ( a - b).