$-\frac{5}{3}x^3y\:.\:\frac{1}{2}xy^2$
$dx=t\left(1+t^2\right)sec^2xdt$
$\frac{5x^4-x^3+3x^2+6x-7}{x+9}$
$81x^2+180x+100$
$( - 32 \cdot 9 ) : 4$
$4\cdot\left(-1\right)-\left(-1\right)-\left(-1\right)$
$-0+2\cdot4$
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