$$\int\left(\frac{x^3+3x+1}{\sqrt{x}}\right)dx$$

$$-9x^2y-8x^2y$$

$$\frac{6x^5-4x^3+3x^2+4}{2x^2-1}$$

$$-13-2\left(3b+4\right)=3\left(b+2\right)$$

$$\frac{2x^3-3x}{x^2-1}$$

$$9z^4+30z^2+25$$

$$x^3+y^3-z^3+\left(x\cdot y+y\cdot z+z\cdot x\right)\cdot\left(x+y+z\right)-x\cdot y\cdot z$$