Obliczenia
[tex]0,3\cdot(\frac{2}{5}-\frac{1}{3})=\frac{3}{10}\cdot(\frac{6}{15}-\frac{5}{15})=\frac{\not3^1}{10}\cdot\frac{1}{\not15_5}=\frac{1}{50}\\\\2,25+\frac{5}{7}\cdot1,4-\frac{1}{2}=2,25+5\cdot0,2-\frac{5}{10}=2,25+1-0,5=3,25-0,5=2,75\\\\(21,75-7\frac{1}{4})\cdot4=(21,75-7\frac{25}{100})\cdot4=(21,75-7,25)\cdot4=14,5\cdot4=58[/tex]
