$-3.5+3.5$
$-0,23+0,2$
$\left(n+\frac{1}{n}\right)^2=5$
$\frac{\sqrt{2\left(x+h\right)}+1-\sqrt{2x+1}}{h}$
$4+5x-7+32x+4$
$\left(2x-2x^4\right)^3$
$5a+20$
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