$5\sqrt{\frac{4}{3}}-8\sqrt{\frac{3}{2}}+3\sqrt{\frac{3}{4}}-6\sqrt{\frac{6}{9}}$

$\int_{\infty}^0\left(e^{-x}\right)dx$

$143+2\left(5x\right)-\left(5x\right)^2$

$\int x^4\left(x+3\right)^3dx$

$\int\frac{\left(8x\right)}{\sqrt{16-x^2}}dx$

$\int2bx^2dx$

$3.\int x\cdot e^{-3x}dx$