so sánh hai phân số 7/5 và 8/5,7/5
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7/5 và 8/3
7/5 = 21/15
8/3 = 40/15
vậy 21/15 < 40/15 hay 7/5 < 8/3
![](https://rs.olm.vn/images/avt/0.png?1311)
5/8 < 7/8
15/25 < 4/5
(Quy đồng như sau )
15 15 x 5 75 4 4 x 25 100
____ = ___________=____ ________=_____________=________
25 25 x 5 125 5 5 x 25 100
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(\dfrac{6}{12}=\dfrac{6:6}{12:6}=\dfrac{1}{2}\)
\(\Rightarrow\dfrac{1}{2}=\dfrac{1\times2}{2\times2}=\dfrac{2}{4}\)
Mà \(\dfrac{2}{4}< \dfrac{3}{4}\)
Vậy \(\dfrac{6}{12}< \dfrac{3}{4}\).
b)
\(\dfrac{8}{10}=\dfrac{8:2}{10:2}=\dfrac{4}{5}\)
Mà \(\dfrac{2}{5}< \dfrac{4}{5}\)
Vậy \(\dfrac{2}{5}< \dfrac{8}{10}\).
c)
\(\dfrac{40}{35}=\dfrac{40:5}{35:5}=\dfrac{8}{7}\)
Mà \(\dfrac{8}{7}>\dfrac{6}{7}\)
Vậy \(\dfrac{40}{35}>\dfrac{6}{7}\).
d)
\(\dfrac{8}{16}=\dfrac{8:8}{16:8}=\dfrac{1}{2}\)
Mà \(\dfrac{1}{2}< \dfrac{5}{2}\)
Vậy \(\dfrac{8}{16}< \dfrac{5}{2}\).
![](https://rs.olm.vn/images/avt/0.png?1311)
1.a) 3/4 > 5/10
b) 35/25 > 16/14
2.a) 7/5 > 5/7
b) 14/16 < 24/21
HT nha
( bạn t.i.c.k cho mik nha, mik cảm ơn )
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{5}{9}< \dfrac{7}{9}\)
b) \(\dfrac{7}{6}>\dfrac{6}{6}\)
c) \(\dfrac{3}{14}< \dfrac{5}{14}\)
d) \(\dfrac{5}{8}< \dfrac{9}{8}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5/8=35/56
3/7=24/56
5/8>3/7
b,5/7=45/63
7/9=49/63
5/7<7/9
c,1/5=3/15
1/5>2/15
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{2}{5}< \frac{8}{11}\)
b) \(\frac{5}{7}>\frac{7}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{10^7+5}{10^7+8}1\)
\(\Rightarrow\frac{10^7+5}{10^7+8}
![](https://rs.olm.vn/images/avt/0.png?1311)
a: 7/8>7/10
b: 16/5>16/7
c: 8/7>1
d: 15/11>1
e: 4/9<1<9/4
f: 11/10>1>10/11
g
g
g
g
gg
TL
ta thấy 7/5<8/5
vì 7<8
vậy 7/5<8/5
HT