$\left(3+3t^2\right)\cdot dy\:=2ty\cdot\left(y^2-1\right)\cdot dx$

$\sqrt[4]{\left(\left(3.1\right)-2\right)\left(\left(3.1\right)-3\right)}$

$-3\left(u+1\right)-1$

$\left(4ab\right)\left(\frac{7}{3}a^{mb^{3n}}c+\frac{4}{5}a^{m-1}b^{3n+2}\right)$

$6x-2<9x-20$

$\left(x-1\right)^2-7>\left(x-2\right)^2$

$-6\cdot51$