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Daca ab-ac= -100 si b-c= -20,calculați a

Răspuns :

a(b-c)=-100 => a•(-20)=-100 => -20a=-100 => a=5
ab - ac = - 100
a(b - c) = - 100
b - c = - 20
a * (- 20) = - 100
20a = 100
a = 5