$$\left(x+2\right)y'=9y$$

$$\left(7x-8y+5z-3u\right)^2$$

$$\left(-3\right)+\left(-4\right)\left(-10\right)-\left(-4\right)$$

$$9-\left(-3\right)+\left(-5\right)-8$$

$$-12\cdot132$$

$$\frac{250}{2.5}$$

$$\lim_{x\to0}\left(x\cdot ln\left(1+\frac{1}{8x}\right)\right)$$