$\left(\frac{3}{2}pq^2-\frac{2}{3}pr^2\right)^4$

$\lim_{x\to\infty}\left(\frac{8x^4-3x^2+1}{4x^3+5x-7}\right)$

$\left(1+x^2\right)=\left(1+y^2\right)\frac{dy}{dx}$

$\lim_{x\to infinity}\left(\frac{ln\left(1+x^3\right)}{ln\left(2+x\right)}\right)$

$x^2+10x=88$

$12.1\cdot1.2$

$3\cdot\left(4+1\right)$