$\lim_{x\to0}\left(2\frac{e^x}{x^2}\right)$
$a+a+2a$
$9v^2-12v+4$
$\left(\frac{3}{4}m^2-5mn\right)^2$
$2k^2+k-7=0$
$\frac { 5 x ^ { 4 } + 6 x ^ { 3 } + 2 x ^ { 2 } + 3 } { x + 1 }$
$3=\frac{x^2+0.6x+0.08}{x^2-1.2x+0.32}$
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