$-\frac{2}{5}a\cdot\frac{15}{8}b\cdot ab$
$x\sqrt{x}^2+1$
$\frac{1.2}{0.04}=1.4$
$\int_1^4\:xe^x\:sen^2\:x\:dx$
$\frac{6x^3-17x^2+16}{3x-4}$
$\left(n^{-4}\right)^{-12}$
$\left(x-30\right)\left(x+30\right)$
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