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27/81=3/9=1/3
có lộn đề ko vậy trời ????????????????????????????????????????
`27/81=(27:27)/(81:27)=1/3`
`57/76=(57:19)/(76:19)=3/4`
`35/84=(35:7)/(84:7)=5/12`
`MSC:12`
`1/3=(1xx4)/(3xx4)=4/12`
`3/4=(3xx3)/(4xx3)=9/12`
`5/12` giữ nguyên
\(\dfrac{27}{81}=\dfrac{1}{3}\); \(\dfrac{57}{76}=\dfrac{3}{4}\); \(\dfrac{35}{84}=\dfrac{5}{12}\)
\(\dfrac{1}{3}=\dfrac{4}{12}\)
\(\dfrac{3}{4}=\dfrac{9}{12}\)
Giữa nguyên 5/12
\(a.\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{1\times3}{2\times3}=\dfrac{3}{6}\)
\(\dfrac{25}{75}=\dfrac{1}{3}=\dfrac{1\times2}{3\times2}=\dfrac{2}{6}\)
\(b.\dfrac{42}{56}=\dfrac{3}{4}=\dfrac{3\times2}{4\times2}=\dfrac{6}{8}\)
\(\dfrac{18}{48}=\dfrac{3}{8}\)
\(c.\dfrac{27}{81}=\dfrac{1}{3}=\dfrac{1\times4}{3\times4}=\dfrac{4}{12}\)
\(\dfrac{57}{76}=\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)
\(\dfrac{35}{84}=\dfrac{5}{12}\)
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a/\(\dfrac{15}{12}=\dfrac{15:3}{12:3}=\dfrac{5}{4}\)
\(\dfrac{27}{6}=\dfrac{27:3}{6:3}=\dfrac{9}{2}=\dfrac{9\times2}{2\times2}=\dfrac{18}{4}\)
b/\(\dfrac{10}{28}=\dfrac{10:2}{28:2}=\dfrac{5}{14}\)
\(\dfrac{40}{7}=\dfrac{40\times2}{7\times2}=\dfrac{80}{14}\)
c/\(\dfrac{14}{60}=\dfrac{7}{30}\)
\(\dfrac{4}{15}=\dfrac{4\times2}{15\times2}=\dfrac{8}{30}\)
#kễnh
\(\frac{10}{15}=\frac{2}{3}\)\(\frac{2}{3}=\frac{2\times4}{3\times4}=\frac{8}{12}\)
\(\frac{12}{16}=\frac{3}{4}\)\(\frac{3}{4}=\frac{3\times3}{4\times3}=\frac{9}{12}\)
em muốn nhanh thì lần sau em tách câu hỏi ra chứ đừng hỏi nhiều trong một câu em nhé
\(\dfrac{12}{48}\) = \(\dfrac{12:12}{48:12}=\) \(\dfrac{1}{2}\) \(\dfrac{49}{140}\) = \(\dfrac{49:7}{140:7}\) = \(\dfrac{7}{20}\)
\(\dfrac{125}{1000}\) = \(\dfrac{125:125}{1000:125}\) = \(\dfrac{1}{8}\) \(\dfrac{352}{253}\) = \(\dfrac{352:11}{253:11}\)= \(\dfrac{32}{23}\)
\(\dfrac{75}{300}=\) \(\dfrac{75:75}{300:75}\) = \(\dfrac{1}{4}\) \(\dfrac{561}{132}\) = \(\dfrac{561:33}{132:33}\) = \(\dfrac{17}{4}\)
