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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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21/81 = 1/9
35/84= 5/12
quy đồng:1/9 = 76/684
57/76= 513/684
5/12= 285/684
nếu đúng cho mk k nha
21 =7
81 27
57 = 3
76 4
35 = 5
84 12
Ta có:
7 = 28 ; 3 = 81 ; 5 = 45
27 108 4 108 12 108
bạn kiểm trai giúp mình nha
=38/47
\(\dfrac{76}{94}=\dfrac{76:2}{94:2}=\dfrac{38}{47}\)