$$n^2-5n+6$$

$$\lim_{x\to y}\left(\frac{\sqrt[3]{x}-\sqrt[3]{y}}{x-y}\right)$$

$$3.6x+8.3x+4-15.9$$

$$12ab+3b+4a+1$$

$$\left(x+7\right)\left(x^2-7x+49\right)$$

$$m\left(6m-7\right)=0$$

$$\frac{10x^5y}{25x^8y}$$