$$\int\frac{4x}{e^{2x}}dx$$

$$-\frac{48}{\left(-20+8.4\right)}-4.\left(2.4+5\right)$$

$$\int4x^2\sin\left(2x+5\right)dx$$

$$2xy^{2}+4xy-3xy^{2}$$

$$\left(4m-5h^2\right)\left(5h^2-4m\right)$$

$$38:\left(-2\right)+5\cdot\left(-7\right)-16$$

$$7k+4k$$