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ab+ac+70=170;a=25;b+c=?

Răspuns :

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