[tex]\Big(\dfrac{7}{4}+\dfrac{7}{8}+\dfrac{7}{12}+...+\dfrac{7}{100}\Big):\Big(\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{12}+...+\dfrac{1}{100}\Big) = \\ \\ = 7\times\Big(\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{12}+...+\dfrac{1}{100}\Big) : \Big(\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{12}+...+\dfrac{1}{100}\Big) = \\ \\ = 7\times 1 =\\ \\ = 7[/tex]
