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Afla suma b+c daca ab+ac+70=170 si a=25

Răspuns :

ab+ac+70=170
a(b+c)=170-70
a(b+c)=100
b+c=100:a
b+c=100:25
b+c=4
ab+ac+70=170
a(b+c)+70=170
a(b+c)=170-70
a(b+c)=100
daca a =25
25 x(b+c)=100
b+c=100:25
b+c=4