Răspuns:
a)[tex]\frac{2x^{2} }{x^{3} } =\frac{2}{x}[/tex]-am simplificat x² cu x³
b)[tex]\frac{5x^{2} y}{xy^{3} } =\frac{5x}{y^{2} }[/tex]
c)[tex]\frac{-3ab^{2} c^{3} }{15a^{3} b^{2} c} =\frac{-c^{2} }{5a^{2} }[/tex]
d)[tex]\frac{x-1}{1-x}=\frac{x-1}{-(x-1)} =\frac{1}{-1}=-1[/tex]
