Matematika A - 2018. ljeto, 4.

$1-3+9-\dots 1-3+9-\backslash ldots$

$1-\frac{1}{2}+\frac{1}{4}-\dots 1-\backslash frac\{1\}\{2\}+\backslash frac\{1\}\{4\}-\backslash ldots$

$1+2+4+\dots 1+2+4+\backslash ldots$

$1+\frac{3}{2}+\frac{9}{4}+\dots 1+\backslash frac\{3\}\{2\}+\backslash frac\{9\}\{4\}+\backslash ldots$