$3x^3-4.3x^3-4$
$\left(7y^2\right)\cdot\left(2y^4+y^3-4y-6\right)$
$\left(\frac{x^2y^{-5}z^4}{xyz}\right)$
$cos\left(2x\right)\cdot\:\:seno\left(x\right)=2sen\left(x\right)^3\:$
$\sqrt[6]{n^5}-2+1$
$25\cdot7-10\cdot5+15\cdot3-5\cdot2$
$\frac{-20}{10}$
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