Răspuns :
a * b = 30.2
a * c = 19.8
Daca adunam cele doua relatii obtinem: a*b + a*c = 30.2 + 19.8
a (b+c) = 50
a * c = 19.8
Daca adunam cele doua relatii obtinem: a*b + a*c = 30.2 + 19.8
a (b+c) = 50
[tex]a*b=30,2 \\ a*c=19,8 \\ a*b+a*c=30,2+19,8 \\ a(b+c)=50 \\ [/tex]