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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 \(\dfrac{8}{16}< \dfrac{5}{2}\).
a: 1/3=8/24
b: 2/7=14/49<14/30
c: 15/35=3/7
d: 8/32=2/8
e: 10/20=100/200
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 )
2/
a/ \(\dfrac{7}{10}=\dfrac{7.15}{10.15}=\dfrac{105}{150}\)
\(\dfrac{11}{15}=\dfrac{11.10}{15.10}=\dfrac{110}{150}\)
-Vì \(\dfrac{105}{150}< \dfrac{110}{150}\)(105<110)nên \(\dfrac{7}{10}< \dfrac{11}{15}\)
b/ \(\dfrac{-1}{8}=\dfrac{-1.3}{8.3}=\dfrac{-3}{24}\)
-Vì \(\dfrac{-3}{24}>\dfrac{-5}{24}\left(-3>-5\right)\)nên\(\dfrac{-1}{8}>\dfrac{-5}{24}\)
c/\(\dfrac{25}{100}=\dfrac{25:25}{100:25}=\dfrac{1}{4}\)
\(\dfrac{10}{40}=\dfrac{10:10}{40:10}=\dfrac{1}{4}\)
-Vì \(\dfrac{1}{4}=\dfrac{1}{4}\)nên\(\dfrac{25}{100}=\dfrac{10}{40}\)
a/ \(\dfrac{7}{10}< \dfrac{11}{15}\)
c/ \(\dfrac{25}{100}=\dfrac{10}{40}\)
a) Ta có :
1912 / 1917 =0,997..
3035/3040 = 0,998...
Vì 0,997...<0,998... nên 1912/1917 < 3035/3040
b)Ta có: 20/18:40/38 = 760/720
Vì 760/720 > 1 nên 20/18 > 40/38
c) Ta có :
Vì 3/7 < 1 ; 7/4 > 1
nên 3/7 < 7/4
d) Ta có : 1/2 = 20/40 ; 2/5 = 16/40 ; 4/8 = 20/40
Vì 10/40 < 16/40 < 20/40 = 20/40
Nên 10/40 < 2/5 < 1/2 = 4/8
e) 8/2 = 4 ; 5/3 = 1,66... ; 6/5 = 1,2 ; 1/6 = 0,16...
Vì 0,16...< 1, 2 < 1,66...< 4
Nên 1/6 < 6/5 < 5/3 / 8/2
\(\frac{-7}{72}\) và \(\frac{9}{-40}\)
* \(\frac{9}{-40}=\frac{-9}{40}\)
Ta có : \(MSC=BCNN(72,40)=360\)
Quy đồng : \(\frac{-7}{72}=\frac{-7\cdot5}{72\cdot5}=\frac{-35}{360}\)
\(\frac{9}{-40}=\frac{-9}{40}=\frac{-9\cdot9}{40\cdot9}=\frac{-81}{360}\)
Mà \(\frac{-35}{360}>\frac{-81}{360}\Rightarrow\frac{-7}{72}>\frac{9}{-40}\)
Vậy : \(\frac{-7}{72}>\frac{9}{-40}\)
40/35 = 8/7