Odpowiedź:
[tex]a) \frac{-\frac{1}{5}+0,1 }{-3,4+\frac{3}{4} } =\frac{-\frac{1}{5}+\frac{1}{10} }{-3\frac{2}{5}+\frac{3}{4} } =\frac{-\frac{2}{10} +\frac{1}{10} }{-3\frac{8}{20}+\frac{15}{20} } =\frac{-\frac{1}{10} }{-2\frac{13}{20} } =-\frac{1}{10} :-\frac{53}{20} =-\frac{1}{10} *-\frac{20}{53} =\frac{2}{53}[/tex]
[tex]b)-4*(-2)+3*(-2)-21:(-7)= 8-6+3=5[/tex]
