$-2.4\left(2x-2.1\right)$
$2,45x^2-0,5x^2-0,25x+4,8$
$\frac{-1}{3\cdot\infty}$
$-3\left(-2\right)\left(-1\right)$
$\frac{5}{4}x^3+\frac{3}{2}x^3$
$4cos^2x+cosx-2$
$a^2+4a+2$
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