rút gọn các phân số sau 8 12 20 48 74 100 1515 1414
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a) \(\dfrac{12}{14}=\dfrac{1200}{1400}=\dfrac{1400-200}{1400}=1-\dfrac{200}{1400}\)
\(\dfrac{1212}{1414}=\dfrac{1414-200}{1414}=1-\dfrac{200}{1414}\)
vì \(\dfrac{200}{1414}< \dfrac{200}{1400}\)
Nên \(1-\dfrac{200}{1400}< 1-\dfrac{200}{1414}\)
Vậy \(\dfrac{12}{14}< \dfrac{1212}{1414}\)
Các bài sau tương tự
![](https://rs.olm.vn/images/avt/0.png?1311)
Kết quả rút gọn lần lượt là: 1 2 ; − 3 8 ; 1 2 ; 2 3 ; 3 2 ; − 15 17
![](https://rs.olm.vn/images/avt/0.png?1311)
Theo thứ tự : 5/6 ; 2/3 ; 2/3 ; 3/2 ; 2/3 ; 3/8 ; 3/1(hay là 3)
\(\dfrac{10}{12}=\dfrac{5}{6}\) \(\dfrac{8}{12}=\dfrac{2}{3}\) \(\dfrac{10}{15}=\dfrac{2}{3}\) \(\dfrac{27}{18}=\dfrac{3}{2}\) \(\dfrac{24}{36}=\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{18}{48}=\dfrac{3}{8}\) \(\dfrac{42}{14}=\dfrac{6}{2}=\dfrac{3}{1}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) − 1212 − 2424 = ( − 1212 ) : ( − 1212 ) ( − 2424 ) : ( − 1212 ) = 1 2
b ) 120120 − 240240 = 120120 : ( − 120120 ) − 240240 : ( − 120120 ) = − 1 2
c) 1313 − 1414 = 1313 : ( − 101 ) − 1414 : ( − 101 ) = − 13 14
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 12/44 = 12 : 4 / 44 : 4 = 3 / 11
b) 1414/1919 =1414 : 101 / 1919 : 101 = 14/19
c)137137/139139 = 137137 : 1001 / 139139 : 1001 = 137 / 139
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Số:
\(\dfrac{12}{18}\) = \(\dfrac{6}{9}\) = \(\dfrac{2}{3}\)
b) Rút gọn các phân số:
\(\dfrac{12}{48}\) = \(\dfrac{1}{4}\)
\(\dfrac{80}{100}\)= \(\dfrac{4}{5}\)
\(\dfrac{75}{125}\) = \(\dfrac{3}{5}\)
Phân số nào vậy bạn?
\(\frac{8}{12}\)\(=\)\(\frac{2}{3}\) \(\frac{1515}{1414}=\frac{15}{14}\)
\(\frac{20}{48}=\frac{5}{12}\)
\(\frac{74}{100}=\frac{37}{50}\)