$$2.15+10.15+19.24$$

$$\:12=\frac{1}{2}x+9$$

$$\int3x^{2\:}sen\:\left(7x^3\right)dx$$

$$-2x\:x\:2y$$

$$\int\left(-2x+1\right)\cdot e^{-x}dx$$

$$\left(\frac{x^{\frac{3}{2}}}{\sqrt{3}y^{\frac{2}{3}}}\right)^2\sqrt[3]{\left(\frac{27y^4}{x^9}\right)}$$

$$x^3-10x^2\:=\:-25x$$