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

Răspuns :

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