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Can someone tell me what font they used to typeset the following equations? (Math font)

Thanks! enter image description here enter image description here enter image description here

1 Answers1

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It looks like Century Schoolbook (or some other Schoolbook). For XeLaTeX or LuaLaTeX one could use TeX Gyre Schola Math which is pretty similar:

\documentclass[a4paper,12pt]{article}

\usepackage{amsmath}
\usepackage{fontspec}
\setmainfont{Century Schoolbook}
\usepackage{unicode-math}
\setmathfont{TeX Gyre Schola Math}
\usepackage[russian]{babel}

\newcommand{\efrac}[2]{\hbox{\footnotesize$\dfrac{#1}{#2}$}}

\begin{document}
Решите неравенство $\efrac{1}{x^2-15x+56}+\efrac{1}{x^2-19x+88}\leqslant0$.
\end{document}

enter image description here

The \efrac tries to imitate the Russian typographic tradition to use eight point font for display math fractions (it looks like that in your example).