$-231\:+\:+1$
$\int_0^{\frac{\pi}{2}}\sqrt{9-x^2}dx$
$4x\:-\:5>6$
$2\cdot\frac{1}{2}+6\left(9+16\right)-4\cdot25$
$\:3,7x-10,2\:.\:3,7x-10,2$
$\int\frac{2}{\left(1-x^2\right)}dx$
$\frac{x^3-9^2+27x-27}{x-3}$
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