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Obliczenia
[tex]-3\frac{2}{3}-1\frac{4}{7}=-(3\frac{2}{3}+1\frac{4}{7})=-(3\frac{14}{21}+1\frac{12}{21})=-4\frac{36}{21}=-5\frac{15}{21}=-5\frac{5}{7}\\\\-2\frac{4}{5}\cdot1\frac{7}{8}=-\frac{\not14^7}{\not5_1}\cdot\frac{\not15^3}{\not8_4}=-\frac{21}{4}=-5\frac{1}{4}\\\\\frac{5}{12}:(-1\frac{4}{5})=\frac{5}{12}:(-\frac{9}{5})=\frac{5}{12}\cdot(-\frac{5}{9})=-\frac{25}{108}[/tex]
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