Răspuns :
face produsul mezilor = produsul extremilor
5(7a+3b)=8(5a+b)
35a+15b=40a+8b
15b-8b=40a-35 a
7b=5a
[tex] \frac{a}{b} = \frac{7}{5} [/tex]
5(7a+3b)=8(5a+b)
35a+15b=40a+8b
15b-8b=40a-35 a
7b=5a
[tex] \frac{a}{b} = \frac{7}{5} [/tex]