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a: 27/-180=-27/180=-3/20=-21/140
-6/-35=6/35=24/120
-3/-28=3/28=15/140
b: \(\dfrac{3\cdot4+3\cdot7}{6\cdot5+9}=\dfrac{3\left(4+7\right)}{30+9}=\dfrac{11}{13}=\dfrac{2849}{13\cdot259}\)
\(\dfrac{6\cdot9-2\cdot17}{63\cdot6-119}=\dfrac{54-34}{259}=\dfrac{20}{259}=\dfrac{260}{259\cdot13}\)
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`(4^2. 5.11)/(44.20)`
`=(4.11.4.5)/(4.11.4.5)`
`=1`
`(13.15.16)/(18.65.7)`
`=(13.15.16)/(2.3.3.13.5.7)`
`=8/21`
`(7.2.8.5^2)/(14.2.5)`
`=(14.2.4.5.5)/(14.2.5)`
`=4.5`
`=20`
`(2^3. 3^3. 5)/(3.2^3. 5^3)`
`=(2^3. 3.5.3^2)/(2^3. 3.5.5^2)`
`=(3^2)/(5^2)`
`=9/25`
**Quy đồng:
`(4^2. 5.11)/(44.20)=1=525/525`
`(13.15.16)/(18.65.7)=8/21=200/525`
`(7.2.8.5^2)/(14.2.5)=20=840/525`
`(2^3. 3^3. 5)/(3.2^3. 5^3)=9/25=189/525`
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a. \(\dfrac{1}{5}\) đã tối giản
\(\dfrac{4}{120}=\dfrac{1}{30}\)
\(\dfrac{-50}{60}=\dfrac{-5}{6}\)
Quy đồng: \(BCNN\left(5,30,6\right)=30\)
\(\Rightarrow\dfrac{1}{5}=\dfrac{1.6}{5.6}=\dfrac{6}{30};\dfrac{1}{30}=\dfrac{1.1}{30.1}=\dfrac{1}{30};\dfrac{-5}{6}=\dfrac{-5.5}{6.5}=\dfrac{-25}{30}\)
b. \(\dfrac{-25}{30}< \dfrac{1}{30}< \dfrac{6}{30}\)
a,\(\dfrac{4}{120}=\dfrac{1}{30};\dfrac{-50}{60}=\dfrac{-5}{6}\)
\(\dfrac{1}{5}=\dfrac{1.6}{5.6}=\dfrac{6}{30};\dfrac{1}{30};\dfrac{-5}{6}=\dfrac{-5.5}{6.5}=\dfrac{-25}{30}\)
b, Vì \(\dfrac{6}{30}>\dfrac{1}{30}>\dfrac{-25}{30}\) nên => \(\dfrac{4}{120}>\dfrac{1}{30}>\dfrac{-50}{60}\)
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a: 12/21=4/7=8/14
4/56=1/14
b: 12/15=4/5=24/30
6/36=1/6=5/30
15/50=3/10=9/30
c: 63/77=9/11=81/99
60/108=5/9=55/99
-18/27=-2/3=-66/99
d: -26/-156=1/6=7/42
49/-14=-7/2=-147/42
32/112=2/7=12/42
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Rút gọn:
\(\dfrac{-1}{6};\dfrac{1}{5};\dfrac{-1}{2}\)
Quy đồng:
\(\dfrac{-5}{30};\dfrac{6}{30};\dfrac{-15}{30}\)
b) Rút gọn:
\(\dfrac{-3}{5};\dfrac{-5}{8};\dfrac{-4}{9}\)
Quy đồng:
\(\dfrac{-216}{360};\dfrac{-225}{360};\dfrac{-160}{360}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: -15/90=-1/6=-5/30
120/600=1/5=6/30
-75/150=-1/2=-15/30
b: -54/90=-3/5=-216/360
-180/288=-5/8=-225/360
-60/135=-4/9=-160/360
c: 212121/353535=3/5=42/70
131313/141414=13/14=65/70
![](https://rs.olm.vn/images/avt/0.png?1311)
e:
e1:40/-90=-4/9=-140/315
-70/-175=4/7=180/315
128/-1440=4/45=28/315
e2: 164/144=41/36
-936/-324=26/9=104/36
-860/720=43/36
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{5\cdot6+5\cdot7}{5\cdot8+20}=\dfrac{5\cdot6+5\cdot7}{5\cdot4\cdot2+5\cdot4}=\dfrac{5\cdot\left(6+7\right)}{5\cdot4\cdot\left(2+1\right)}=\dfrac{5\cdot13}{5\cdot4\cdot3}=\dfrac{13}{4\cdot3}=\dfrac{13}{12}\)
\(\dfrac{5.6+5.7}{5.8+20}\)
=\(\dfrac{5.\left(6+7\right)}{5.\left(8+4\right)}\)
=\(\dfrac{5.13}{5.12}\)
=\(\dfrac{13}{12}\)
-28/32=-28:4/32:4=-7/8