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em muốn nhanh thì lần sau em tách câu hỏi ra chứ đừng hỏi nhiều trong một câu em nhé
\(\dfrac{12}{48}\) = \(\dfrac{12:12}{48:12}=\) \(\dfrac{1}{2}\) \(\dfrac{49}{140}\) = \(\dfrac{49:7}{140:7}\) = \(\dfrac{7}{20}\)
\(\dfrac{125}{1000}\) = \(\dfrac{125:125}{1000:125}\) = \(\dfrac{1}{8}\) \(\dfrac{352}{253}\) = \(\dfrac{352:11}{253:11}\)= \(\dfrac{32}{23}\)
\(\dfrac{75}{300}=\) \(\dfrac{75:75}{300:75}\) = \(\dfrac{1}{4}\) \(\dfrac{561}{132}\) = \(\dfrac{561:33}{132:33}\) = \(\dfrac{17}{4}\)
\(\dfrac{18}{45}=\dfrac{2}{5}\dfrac{63}{81}=\dfrac{7}{9}\) minh chi co the lam the nay thoi vi minh dang co viec gap
\(a.\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{1\times3}{2\times3}=\dfrac{3}{6}\)
\(\dfrac{25}{75}=\dfrac{1}{3}=\dfrac{1\times2}{3\times2}=\dfrac{2}{6}\)
\(b.\dfrac{42}{56}=\dfrac{3}{4}=\dfrac{3\times2}{4\times2}=\dfrac{6}{8}\)
\(\dfrac{18}{48}=\dfrac{3}{8}\)
\(c.\dfrac{27}{81}=\dfrac{1}{3}=\dfrac{1\times4}{3\times4}=\dfrac{4}{12}\)
\(\dfrac{57}{76}=\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)
\(\dfrac{35}{84}=\dfrac{5}{12}\)
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1) Ta có : \(\frac{49}{28}=\frac{49:7}{28:7}=\frac{7}{4}\)
\(\frac{85}{51}=\frac{85:17}{51:17}=\frac{5}{3}\)
\(\frac{64}{96}=\frac{64:32}{96:32}=\frac{2}{3}\)
\(\frac{1212}{3030}=\frac{1212:606}{3030:606}=\frac{2}{5}\)
\(\frac{32032}{48048}=\frac{32032:16016}{48048:16016}=\frac{2}{3}\)
\(\frac{1339}{1442}=\frac{1339:103}{1442:103}=\frac{13}{14}\)
Bài 1 :
49/28 =7/4 85/51=5/3 64/96=2/3 1212/3030=2/5 32032/48048=2/3 1339/1442=13/14
7/19
7/4
7/5
a7/19
b7/4
c7/5