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3/4 va 4/5
Quy dong len mau 20
15/20 va 16/20
15<16
Suy ra 15/20<16/20
3/4<4/5
b)5/8 va 4/9
Quy ddong len 72
40/72 va 32/72
40>32
40/72>32/72
Suy ra :5/8>4/9
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2003 / 2001 = 1 + 2/2001
1999/1997 = 1 + 2/1997
vì 2/ 2001 < 2/1997
nên 1 + 2/2001 < 1 + 2/1997
hay 2003 < 1999/1997
b, = 5/9 x 1/4 + 4/9 x 1/4
= 1/4 x ( 5/9 + 4/9 )
= 1/4 x 1
= 1/4
* Ý a mk k nhớ cách làm ^^, xl *
\(b,\dfrac{5}{9}\times\dfrac{1}{4}+\dfrac{4}{9}\times\dfrac{3}{12}\)
\(=\dfrac{5}{9}\times\dfrac{1}{4}+\dfrac{4}{9}\times\dfrac{1}{4}\)
\(=\dfrac{1}{4}\times\left(\dfrac{5}{9}+\dfrac{5}{9}\right)\)
\(=\dfrac{1}{4}\times\dfrac{9}{9}=\dfrac{1}{4}\times1=\dfrac{1}{4}\)
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- 3/4 < 4/3 (vì 3/4 < 1 < 4/3 nên 3/4 < 4/3).
- 10/7 > 7/9 (vì 10/7 > 1 > 7/9 nên 10/7 > 7/9).
- 12/11 > 11/10 (vì 12/11 > 1 > 11/10 nên 12/11 > 11/10).
3/4 < 4/3 vi 3/4 be hon 1con 4/3 lon hon 1
10/7 > 7/9 vi 10/7 lon hon 1 con 7/9 be hon 1
12/11 > 11/10 vi 12/11 lon hon 1 con 11/10 be hon 1
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\(\frac{6}{7}\)\(< \)\(1\)\(< \)\(\frac{3}{2}\)
=> \(\frac{6}{7}\)\(< \)\(\frac{3}{2}\)
@Cỏ
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Bài 2:
a: 5/4<7/4
b: 2/3=34/51
9/17=27/51
mà 34>27
nên 2/3>9/17
Bài 3:
a: 1/3+3/8=8/24+9/24=17/24
b: 7/6+5/18=21/18+5/18=26/18=13/9
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a . 21/70 = 3/10 ; 56/96 = 7/12 ; 60/72 = 15/18
Mình chỉ làm tới đây thôi .
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a) \(\dfrac{3}{4}=\dfrac{3\times4}{4\times4}=\dfrac{12}{16}\)
b) \(\dfrac{1}{3}=\dfrac{1\times3}{3\times3}=\dfrac{3}{9}\)
c) \(\dfrac{5}{6}=\dfrac{5\times3}{6\times3}=\dfrac{15}{18}\)
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a) Ta có :
1 - 2007/2008 = 1/2008
1 - 2008/2009 = 1/2009
Vì 1/2008 > 1/2009 nên 2007/2008 < 2008/2009
b) Ta có :
4/9 < 4/8 = 1/2
25/48 > 24/48 = 1/2
Vì 4/9 < 1/2 < 25/48 nên 4/9 < 25/48