Question

1.Afla a daca ab+ac=520 si b+c=15
2.Afla aflal pe a daca,ab-ac=45 si b-c=9
3.afla suma b+c ,daca ab=ac+70=170si a=25
4.Afla diferenta b-c,daca ab-ac-48=2 si a =10

Answer 1

1.Afla a daca ab+ac=520 si b+c=15
a(b+c)=520
a=520:(b+c)
a=520:15
a=34,(6)

2.Afla aflal pe a daca,ab-ac=45 si b-c=9
a(b-c)=45
a=45:(b-c)
a=45:9
a=5

3.afla suma b+c ,daca ab=ac+70=170 si a=25
25b=25c+70
25b-25c=70
25(b-c)=70
b-c=70:25
b-c=2,8
Verifica enuntul, cred ca este o greseala undeva

4.Afla diferenta b-c,daca ab-ac-48=2 si a =10
a(b-c)=2+48
10(b-c)=50
b-c=50:10
b-c=5