$\log\left(x-2\right)+\log\left(x-4\right)=\log\left(7\right)$
$\lim_{x\to-5}\left(7x^6-4x^5+2x^3-x-15\right)$
$\left[\left(3^2\right)^2\right]^3$
$-5,87+48,73-5,4+98,75$
$\left(-1\right)\cdot34$
$\left(f+2\right)\left(2f-3\right)$
$4x^2+7x-11$
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