$\frac{d}{dx}4y$

$0x^{2}y-15xy^{2}+25xy$

$0,00390625\:+\:0,001953125\:+\:0,000439$

$\left(x^{-2}+y^{-3}\right)\left(x^{-2}-y^{-3}\right)$

$\frac{3x+1}{4}-\frac{1}{3}\le\frac{2}{15}\left(3x+2\right)+\frac{4\left(1+x\right)}{3}$

$-6+-4+-4+-2u-5u+-5$

$\left(2x+x-1\right)+\left(2x+3x-3\right)$