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In the framework of the mass mixing scheme we have considered mixings andoscillations of $\nu_e, \nu_\mu, \nu_\tau$ neutrinos and obtained expressionsfor angle mixings and lengths of oscillations in dependence on components ofthe nondiagonal mass matrix. Then analysis of these obtained results was doneby using modern experimental data on neutrino oscillations. It has been shownthat in this approach the lengths of neutrino oscillations $L_{2 3}$ and $L_{13}$ are not compulsory to be equal. It means that the angle mixing $\theta_{13}$ can be not very small, i.e., $L_{1 3}$ can be larger than $L_{2 3}$.  In the conventional approach $L_{1 3} \approx L_{2 3}$ ($L_{1 2} \gg L_{23}$) and angle mixing of $\theta_{1 3}$ is very small. Angle mixings $\theta_{23}, \theta_{1 2}$ are big. Then there ia a problem: why is mixing angle$\theta_{1 3}$ so small? A natural solution of the problem is to suppose that$(m_2^2 - m_1^2) \neq (m_3^2 - m_1^2) - (m_3^2 - m_2^2)$, then $L_{1 3} > L_{23}$. It will be realized if there are 4 neutrino oscillations instead of 3neutrino oscillations. Then the value of $\theta_{1 3}$ is necessary to searchat distances more than $L_{2 3}$.

Neutrino oscillations in the scheme of mass mixings and problem of smallness of angle mixing $\theta_{1 3}$