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TL
5/2 - 1/3 + 1/4 = 15/12 - 4/12 + 3/12 = 11/12 + 3/12 = 14/12
#vohuudoan
ht
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(3+\dfrac{5}{2}=\dfrac{6}{2}+\dfrac{5}{2}=\dfrac{11}{2}\)
b) \(\dfrac{2}{8}:\dfrac{4}{8}=\dfrac{2}{8}.\dfrac{8}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)
c) \(\dfrac{13}{5}-2=\dfrac{26}{10}-\dfrac{20}{10}=\dfrac{6}{10}=\dfrac{3}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{2}{9}+\dfrac{3}{5}-\dfrac{1}{15}=\dfrac{37}{45}-\dfrac{1}{15}=\dfrac{37}{45}-\dfrac{3}{45}=\dfrac{34}{45}\)
b) \(\dfrac{5}{12}\times\dfrac{4}{5}\div4=\dfrac{1}{3}\div4=\dfrac{1}{12}\)
c) \(\dfrac{8}{9}-\dfrac{4}{15}\div\dfrac{2}{5}=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{2}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2/3 x X = 1/4 X x 1/5 = 1/2 X : 7/8 = 2/3
X = 1/4 : 2/3 X = 1/2 : 1/5 X = 2/3 x 7/8
X = 3/8 X = 5/2 X = 7/12
chúc bạn học tôt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\dfrac{7}{12}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{7}{12}+\dfrac{1}{6}=\dfrac{7}{12}+\dfrac{2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)
\(b,\dfrac{8}{9}-\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{8}{9}-\dfrac{4}{15}\times\dfrac{5}{2}=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{2}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
`9/2-3`
`=9/2-6/2`
`=3/2`
b)
`8/5xx25/12`
`=10/3`
c)
`4:3/7`
`=4xx7/3`
`=28/3`
a: 3/5+1/2=6/10+5/10=11/10
b: 3/2+5/4+5/8=12/8+10/8+5/8=27/8
c: 1/6+4/5+5/2=5/30+24/30+75/30=104/30=52/15
a \(\dfrac{11}{10}\)
b \(\dfrac{27}{8}\)
c \(\dfrac{52}{15}\)