$x3+yx2=3\:\:\:$

$\frac{4x-7}{6x^2+13x-5}$

$\log_{12}\left(2x\right)+\log_{12}\left(x-1\right)=1$

$-12,43+8,11$

$\int\left(\frac{9}{x^2\cdot\:\sqrt[2]{x^2-81}}\right)dx$

$\cos x+2x\right)^{2}$

$\left(-23\right)\cdot\left(-12\right)\cdot4\cdot10\cdot7\cdot\left(-1\right)\cdot\left(-9\right)$