documentclass[preview]{standalone}

usepackage{cmbright}
SetSymbolFont{largesymbols}{normal}{OMX}{iwona}{m}{n}

usepackage{mathtools}
begin{document}
Text
$displaystyle
abc+sum_{k=1}^{n}int_{0}^{k}sqrt{2}f(x),text{d}x
$
Text
end{document}

documentclass[preview]{standalone}

usepackage{arevtext,arevmath}

usepackage{mathtools}
begin{document}
Text
$displaystyle
abc+sum_{k=1}^{n}int_{0}^{k}sqrt{2}f(x),text{d}x
$
Text
end{document}

documentclass[preview]{standalone}

usepackage{sansmathfonts}
usepackage[scaled=0.95]{helvet}
renewcommand{rmdefault}{sfdefault}

usepackage{mathtools}
begin{document}
Text
$displaystyle
abc+sum_{k=1}^{n}int_{0}^{k}sqrt{2}f(x),text{d}x
$
Text
end{document}

documentclass[preview]{standalone}

usepackage[sfdefault,scaled=.85]{FiraSans}
usepackage[T1]{fontenc}
usepackage{textcomp}
usepackage[varqu,varl]{zi4}% inconsolata typewriter
usepackage{amsmath,amsthm}
usepackage[cmintegrals]{newtxsf}

usepackage{mathtools}
begin{document}
Text
$displaystyle
abc+sum_{k=1}^{n}int_{0}^{k}sqrt{2}f(x),text{d}x
$
Text
end{document}

documentclass[preview]{standalone}

usepackage{helvet}
renewcommand{familydefault}{sfdefault}
usepackage{sansmath}
sansmath

usepackage{mathtools}
begin{document}
Text
$displaystyle
abc+sum_{k=1}^{n}int_{0}^{k}sqrt{2}f(x),text{d}x
$
Text
end{document}