Răspuns :
Răspuns:
a+b=25
a-b=5
a=b+5
25=b+b+5
25-5=20=2b
b=20:2=10
a=b+5=15
R:
a=15
b=10
a+b=25
a-b=5 => a= 5+b
5+b+b=25
5+2b=25
2b=25-5
2b=20
b=20:2
b=10
a=10+5
a=15
Răspuns:
a+b=25
a-b=5
a=b+5
25=b+b+5
25-5=20=2b
b=20:2=10
a=b+5=15
R:
a=15
b=10
a+b=25
a-b=5 => a= 5+b
5+b+b=25
5+2b=25
2b=25-5
2b=20
b=20:2
b=10
a=10+5
a=15