Markdown KeTeX formula Left display

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Inline formula is the default left home, the equation between the lines centered by default.
effect:
$\begin{aligned}P(X\le2)&=P(X=0)+P(X=1)+P(X=2)\\ &=e^{-2}+\frac{2\cdot e^{-2}}{1!}+\frac{2^2\cdot e^{-2}}{2!}=5e^{-2}\end{aligned}$
Code:

$\begin{aligned}P(X\le2)&=P(X=0)+P(X=1)+P(X=2)\\
&=e^{-2}+\frac{2\cdot e^{-2}}{1!}+\frac{2^2\cdot e^{-2}}{2!}=5e^{-2}\end{aligned}$