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a) \(\frac{15}{10}=1,5\) \(\frac{675}{10}=6,75\) \(\frac{7}{10}=0,7\)
\(\frac{79}{100}=0,79\) \(\frac{5}{100}=0,05\) \(\frac{67}{100}=0,67\)
b) \(\frac{1}{2}=1\div2=0,5\) \(\frac{3}{4}=3\div4=0,75\)
\(\frac{15}{8}=15\div8=1,875\) \(\frac{7}{25}=7\div25=0,28\)
\(\frac{19}{30}=19\div30=0,63\) \(\frac{21}{125}=21\div125=0,168\)
Ta có :
\(\frac{1}{2}=1\div2=0,5\)
\(\frac{2}{3}=2\div3=0,666...\)
\(\frac{3}{4}=3\div4=0,75\)
\(\frac{4}{5}=4\div5=0,8\)
\(\frac{5}{6}=5\div6=0,8333...\)
\(\frac{6}{7}=6\div7=0,8671...\)
\(\frac{7}{8}=7\div8=0,875\)
\(\frac{8}{9}=8\div9=0,888...\)
Vậy các phân số có thể là : \(\frac{1}{2};\frac{3}{4};\frac{4}{5};\frac{7}{8}\)
\(\frac{18}{10}=1\frac{4}{5}\)
\(\frac{21}{8}=2\frac{5}{8}\)
\(\frac{100}{9}=11\frac{1}{9}\)
\(\frac{81}{10}=8\frac{1}{10}\)
\(\frac{16}{5}=3\frac{1}{5}\)
\(\frac{18}{10}=1\frac{8}{10}\) \(\frac{21}{8}=2\frac{5}{8}\)
\(\frac{100}{9}=11\frac{1}{9}\) \(\frac{81}{10}=8\frac{1}{10}\)
\(\frac{16}{5}=3\frac{1}{5}\)
\(3\frac{1}{2}=\frac{3.2+1}{2}=\frac{7}{2}\)
\(13\frac{2}{3}=\frac{13.3+2}{3}=\frac{41}{3}\)
\(5\frac{7}{8}=\frac{5.8+7}{8}=\frac{47}{8}\)
\(17\frac{1}{4}=\frac{17.4+1}{4}=\frac{69}{4}\)
\(4\frac{2}{9}=\frac{4.9+2}{9}=\frac{38}{9}\)
\(21\frac{5}{9}=\frac{21.9+5}{9}=\frac{194}{9}\)
\(10\frac{5}{8}=\frac{10.8+5}{8}=\frac{85}{8}\)
\(14\frac{1}{5}=\frac{14.5+1}{5}=\frac{71}{5}\)
\(\left(\frac{21}{8}+\frac{1}{2}\right)\div\frac{5}{16}\)
\(\Leftrightarrow\left(\frac{21}{8}+\frac{4}{8}\right)\times\frac{16}{5}\)
\(\Leftrightarrow\frac{25}{8}\times\frac{16}{5}\)
\(\Leftrightarrow10\)