$\frac{5-\sqrt{-5}}{5}$
$\left(-3\right)\:.\:\left(+2\right)\:.\:\left(-7\right)\:.\:\left(+10\:.\:\left(+5\right)\right)$
$\frac{7x^2.-7x^3y^4}{5x^3y^3}$
$157,659+789$
$4\sqrt{-81}-3\sqrt{-36}+4\sqrt{25}$
$6\cdot3+2$
$\left(5v+1\right)^2$
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