$$\frac{1}{6x^{2}+\frac{1}{3}x}+\frac{4}{9}$$

$$25\left(x+y\right)^{2}-441\left(x-y\right)^{2}$$

$$\left(\frac{3}{5}p+\frac{1}{2}\right)\left(\frac{3}{5}p-\frac{1}{2}\right)$$

$$2^{5x-1}=2^{5x+6}$$

$$0.5\cdot2470\cdot23.05^2$$

$$4x^2+8y^2+4+4x^2-5y^2-2$$