Rút gọn các phân số 5/10 3/15 40/70 24/36 70/42
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\(\frac{40}{70}=\frac{40:10}{70:10}=\frac{4}{7}\)
\(\frac{24}{36}=\frac{24:12}{36:12}=\frac{2}{3}\)
\(\frac{70}{42}=\frac{70:14}{42:14}=\frac{5}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1. \(\frac{5}{10}=\frac{1}{2};\frac{3}{15}=\frac{1}{5};\frac{40}{70}=\frac{4}{7};\frac{24}{36}=\frac{2}{3};\frac{70}{42}=\frac{5}{3}\)
2. a) MSC: 12
Ta có: \(\frac{5}{3}=\frac{5.4}{3.4}=\frac{20}{12};\frac{1}{4}=\frac{1.3}{4.3}=\frac{3}{12}\)
b) MSC: 24
Ta có: \(\frac{3}{8}=\frac{3.3}{8.3}=\frac{9}{24}\) và \(\frac{7}{24}\)
c) MSC: 30
Ta có: \(\frac{1}{2}=\frac{1.15}{2.15}=\frac{15}{30}\)
\(\frac{2}{3}=\frac{2.10}{3.10}=\frac{20}{30}\)
\(\frac{3}{5}=\frac{3.6}{5.6}=\frac{18}{30}\)
1.
\(\frac{5}{10}\)= \(\frac{5:5}{10:5}\)= \(\frac{1}{2}\) \(\frac{3}{15}\)= \(\frac{3:3}{15:3}\)= \(\frac{1}{5}\)
\(\frac{40}{70}\)= \(\frac{40:10}{70:10}\)= \(\frac{4}{7}\) \(\frac{24}{36}\)= \(\frac{24:12}{36:12}\)= \(\frac{2}{3}\)
\(\frac{70}{42}\)= \(\frac{70:14}{42:14}\)= \(\frac{5}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`6/10=3/5`
`70/9=70/9`
`96/72=4/3`
`45/35=9/7`
`24/36=2/3`
`25/100=1/4`
![](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)
\(\dfrac{10}{12}=\dfrac{5}{6}\) \(\dfrac{8}{12}=\dfrac{2}{3}\) \(\dfrac{10}{15}=\dfrac{2}{3}\) \(\dfrac{27}{18}=\dfrac{3}{2}\) \(\dfrac{24}{36}=\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{18}{48}=\dfrac{3}{8}\) \(\dfrac{42}{14}=\dfrac{6}{2}=\dfrac{3}{1}\)
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a) n(n+2)
b) (3n-2)3n
c) ( 1) 1 n n 2
d) 1+n2 e) n(n+5)
f) (3n-2)(3n+1)
g) n ( n 3) 2 n n
h) ( 1)( 2) 2
i) n ( n 1)( n 2)
![](https://rs.olm.vn/images/avt/0.png?1311)
Kết quả rút gọn làn lượt là: 1 2 ; 1 2 ; − 1 5 ; 1 2 ; 3 8 ; 2 3 ; 3 2 ; − 5 9
1/2 , 1/5, 4/7, 2/3 , 5/3
5/10=1/2
3/15=1/5
40/70=4/7
24/36=2/3
70/42=5/3
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