$\left(-1.1\right)^6-\left(-1.1\right)^5-\left(-1.1\right)^4+\left(-1.1\right)^3-\left(-1.1\right)^2+-1.1+1$
$-3+5\cdot4-6\cdot7-\left(-8-9+7\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x+9}-3}{y}\right)$
$e^{x-y}=0$
$a^2-6ab^2+ab^2$
$2x^2+10x=9$
$x^2+4=6x$
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