Cześć ;-)
Od a) do c)
[tex]\frac{2}{5}+0,77=\frac{4}{10}+0,77=0,4+0,77=1,17\\\\15,4+3\frac{1}{3}=15\frac{4}{10}+3\frac{1}{3}=15\frac{2}{5}+3\frac{1}{3}=15\frac{6}{15}+3\frac{5}{15}=18\frac{11}{15}\\\\8\frac{3}{4}+1,125=8\frac{75}{100}+1,125=8.75+1,125=9,875[/tex]
Od d) do f)
[tex]1,75-\frac{5}{6}=1\frac{75}{100}-\frac{5}{6}=1\frac{3}{4}-\frac{5}{6}=1\frac{9}{12}-\frac{10}{12}=\frac{21}{12}-\frac{10}{12}=\frac{11}{12}\\\\3\frac{1}{5}-2,25=3\frac{2}{10}-2,25=3,2-2,25=0,95\\\\6,8-5\frac{1}{4}=6,8-5\frac{25}{100}=6,8-5,25=1,55[/tex]
Od g) do i)
[tex]6,4\cdot\frac{5}{8}=0,8\cdot5=4\\\\\frac{2}{5}\cdot0,75=\frac{2}{15}\cdot\frac{75}{100}=\frac{2}{15}\cdot\frac{3}{4}=\frac{6}{60}=\frac{1}{10}\\\\1\frac{3}{7}\cdot0,056=\frac{10}{7}\cdot\frac{56}{1000}=\frac{8}{100}=\frac{2}{25}[/tex]
Od j) do l)
[tex]2,4:1\frac{3}{5}=2\frac{4}{10}:\frac{8}{5}=2\frac{2}{5}:\frac{8}{5}=\frac{12}{5}\cdot\frac{5}{8}=\frac{3}{2}=1\frac{1}{2}\\\\3\frac{3}{4}:0,05=\frac{15}{4}:\frac{5}{100}=\frac{15}{4}:\frac{1}{20}=\frac{15}{4}\cdot20=15\cdot5=75\\\\2\frac{5}{6}:3,4=\frac{17}{6}:3\frac{4}{10}=\frac{17}{6}:3\frac{2}{5}=\frac{17}{6}:\frac{17}{5}=\frac{17}{6}\cdot\frac{5}{17}=\frac{5}{6}[/tex]
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