ngaje

\frac{{\displaystyle\sum_{n>0}z^n}}
{{\displaystyle\prod_{1\leqk\leqn}(1-q^k)}}

$\frac{\sum_{n>0}z^n}
{\prod_{1\leqk\leqn}(1-q^k)}$

$\frac{{\displaystyle\sum_{n>0}z^n}}
{{\displaystyle\prod_{1\leqk\leqn}(1-q^k)}}$

$\frac{{\displaystyle\sum\nolimits_{n>0}z^n}}
{{\displaystyle\prod\nolimits_{1\leqk\leqn}(1-q^k)}}$

$$\frac{{\displaystyle\sum\nolimits_{n>0}z^n}}
{{\displaystyle\prod\nolimits_{1\leqk\leqn}(1-q^k)}}$$

Ref:
shot-math-guide.pdf

$$\dfrac{\frac{\huge 7}{r}+\frac{1}{x}}{\frac{3x}{d} + \frac{2t}{5k}}$$

$$\dfrac{\frac\huge{ 7}{r}+\frac{1}{x}}{\frac{3x}{d} + \frac{2t}{5k}}$$


$$\frac{{\displaystyle\frac{7}{r}+\frac{1}{x}}{{\displaystyle\frac{3x}{d} + \frac{2t}{5k}}$$

$$\frac{{\displaystyle\frac{7}{r}+\frac{1}{x}}{{\frac{3x}{d} + \frac{2t}{5k}}$$