Question

Rezolva uramatoarele cerinte:
a) afla nr a, daca ab + ac=520si b+c=52
b) afla nr a,daca ab-ac=45 si b-c=9
c) afla suma b+c,daca ab+ac+70=170si a=25
d) afla diferentab-c, daca ab-ac-48=2si a=10

Repede va roooooog

Answer 1

ab+ac=520
a(b+c)=520
a*52=520
a=10
b)ab-ac=45
a(b-c)=45
a*9=45
a=5
c)ab+ac+70=170
a(b+c)=100
b+c=100/25
b+c=4
d)ab-ac-48=2
a(b-c)=50
b-c=5