$19ab+22ab-12ab+3ab$
$150+100+75-70-35-20$
$1+-8+-10+8+8$
$\left(9x-8\right)\left(7x-3\right)\left(2x+1\right)\left(5x+4\right)$
$\left(6x^{4}+13x^{3}+11x^{2}+6x-5\right):\left(2x^{2}+x\right)$
$5\cdot\left(-3\right)+4\cdot3-6$
$\lim_{x\to\infty}\frac{\left(1+\frac{1}{x}\right)^{x^2}}{e^x}$
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