$x^2-2x+y^2-4y+\frac{11}{4}=0$
$\frac{\left(x^3-4x^2+9\right)}{x-4}$
$\lim_{x\to0}\left(\frac{3x^3}{9x-sen2x}\right)$
$\left(\left(\sqrt[3]{x}\right)^4\right)^2$
$.500b-6b+14b-6b-\left(7b-2b\right)+\left(4b-b\right)$
$\left(x^2+\frac{1}{4}\right)\left(x^2-\frac{3}{4}\right)$
$4x+3+2x+1$
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