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


Răspuns :

a(b+c)+70=170
25×(b+c)=170-70
b+c=100:25
b+c=4
a(b + c) + 70 = 170
25·(b + c) = 170 - 70
25·(b + c) = 100
(b + c) = 100 : 25
(b + c) = 4