Răspunsuri

2014-11-04T14:09:53+02:00
A+b=21
a:b=4.1
a=4b+1
4b+1+b=21
5b=21-1
5b=20
b=20:5
b=4

a+4=21
a=21-4
a=17
2014-11-04T14:16:11+02:00
A+b=21
a=bx4+1
a=4b+1
inlocuim pe a in prima ecuatie
4b+1+b=21
5b=21-1
5b=20
b=4
a=4x4+1=16+1=17