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fie a,b,c 3 nr naturale direct proportionale cu numerele 3 ,5 si 7 demonstarati ca a+c = 2b

Răspuns :

[tex] \frac{a}{3} = \frac{b}{5} = \frac{c}{7} [/tex]

[tex]a = \frac{3b}{5} [/tex]

[tex]c = \frac{7b}{5} [/tex]

[tex]a + c = \frac{10b}{5} = 2b[/tex]