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daca a,b,c ∈ N si ab + ca =715, calculati 18a(5b+5c)

Răspuns :

Salut,

ab+ca = 715 → a(b+c) = 715.

18a(5b+5c) = 18a•5(b+c) = 90a(b+c) = 90•715 = 64350.


Succes! :3
ab+ca=715
a(b+c)=715
18a(5b+5c)=
=18a*5(b+c)=
=90a(b+c)=
=90*715=64350