$3\cdot\left(4+1\right)$
$+10+7-9-9+1+2+2$
$xy-yz+4xz;\:x=-2;\:y=3;\:z=-5$
$\int\frac{2x}{\left(x^2+x+1\right)\left(x^2+4\right)}dx$
$\int_0^1\sqrt{4t^2}dx$
$\int x\cdot\sqrt[2]{\left(2-0.5x\right)}dx$
$\frac{3}{\left(1+2x\right)^2}$
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