$$1.25+2.75+1.50$$

$$\lim_{x\to1}\left(\frac{x^4+x-2}{3x^3+2x+5}\right)$$

$$\:xy-2x^2-y=3$$

$$\int\left(x+3\right)^3\cdot\:ln\left(x-3\right)\:dx$$

$$x^2-11x=0$$

$$y=\frac{4x^{2}-16}{x-2}$$

$$i'=\frac{1+2t}{2i}$$