$\left(+14\right)+\left(-21\right)-\left(-18\right)-\left(+27\right)-\left(-11\right)$

$\left(-3\right)^2\cdot4+\sqrt{100}\cdot\left(-5\right)-64:\left(-2\right)^3$

$9x^4+6x^3-5x^2+7;\:x=1$

$2x^2+8x+1=0$

$\lim_{x\to-1}\left(-2\right)$

$\frac{d}{dx}3x^2-xy+4y^2-2x+1=0$

$1.1063-22.8472$