15.
[tex]a) \ \frac{3}{10} = 0,3\\\\b) \ 3\frac{2}{100} = 3,02\\\\c) \ 2\frac{5}{10} = 2,5\\\\d) \ \frac{11}{1000} = 0,011[/tex]
17.
[tex]1,7 = \frac{17}{10} = 1\frac{7}{10}\\\\0,09 = \frac{9}{100}[/tex]
18.
[tex]8\frac{3}{5} = 8\frac{3\cdot2}{5\cdot2} = 8\frac{6}{10} = 8,6\\\\\frac{8}{25} = \frac{8\cdot4}{25\cdot4} = \frac{32}{100} = 0,32[/tex]
19.
[tex]a) \ \frac{1}{8} = \frac{1\cdot125}{8\cdot125} = \frac{125}{1000} = 0,125\\\\b) \ \frac{3}{4} = \frac{3\cdot25}{4\cdot25} = \frac{75}{100} = 0,75\\\\c) \ \frac{8}{25} = \frac{8\cdot4}{25\cdot4} = \frac{32}{100} = 0,32[/tex]
20.
[tex]\frac{0,3-0,2}{2} = \frac{0,1}{2} = 0,05\\\\\underline{a = 5,2+0,05 = 5,24}\\\\\\\frac{0,47-0,46}{2} = \frac{0,01}{2} = 0,005\\\\\underline{b = 4,46+0,005 = 4,465}[/tex]
