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a) Ta có:
\(\frac{23}{3}=\frac{21+2}{3}=\frac{21}{3}+\frac{2}{3}=7+\frac{2}{3}\)
\(\frac{15}{2}=\frac{14+1}{2}=\frac{14}{2}+\frac{1}{2}=7+\frac{1}{2}\)
Lại có:\(1-\frac{2}{3}=\frac{1}{3}< 1-\frac{1}{2}=\frac{1}{2}\Rightarrow\frac{2}{3}>\frac{1}{2}\)
\(\Rightarrow\frac{23}{3}>\frac{15}{2}\)
a, 23/3 và 15/2
Ta có :
23/3 = 23x2/3x2 = 46/6. 15/2 = 15x3/2x3 = 45/6.
Vậy 46/6 > 45/6 nên 23/3 > 15/2.
b, 4/17 và 2/9.
Ta có :
4/17 = 4x9/17x9 = 36/153. 2/9 = 2x17/9x17 = 34/153.
Vậy 36/153 > 34/153 nên 4/17 > 2/9.
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C1: 2/3 x (4/5 x 5/6) = 2/3 x 2/3 = 4/9
C2: (2/3 x 4/5) x 5/6 = 8/15 x 5/6 = 4/9
\(\frac{2}{3}x\frac{4}{5}x\frac{5}{6}\)
\(=\frac{8}{15}x\frac{5}{6}\)
\(=\frac{4}{9}\)
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a, \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)
\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)
\(=1+\frac{3}{5}\)
\(=\frac{8}{5}\)
b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)
\(=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)\)
\(=\frac{3}{2}+2\)
\(=\frac{7}{2}\)
c, \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)
\(=2+\frac{3}{4}\)
\(=\frac{11}{4}\)
nhớ ấn đúng giùm tớ nha
a) = 8 phần 5
b) = 7 phần 2
c) = 11 phần 4
nhớ ấn giùm tớ nha
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a) Ta có \(\frac{2013}{2014}=1-\frac{1}{2014}\)và \(\frac{2014}{2015}=1-\frac{1}{2015}\)
mà \(\frac{1}{2014}>\frac{1}{2015}\)nên \(\frac{2013}{2014}< \frac{2014}{2015}\)
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=54.275+275+825.15
=275.55+825.15
=275.55+55.15.15
=55.(275+225)
=55.500
=27500
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\(\frac{1997x1996-1}{1995x1997+1996}\)
\(=\frac{1995x1997+1997-1}{1995x1997+1996}\)
\(=\frac{1995x1997+1996}{1995x1997+1996}\)
\(=1\)
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\(\frac{1996x1995-996}{1000+1996x1994}\)
\(=\frac{1996x1994+1996-996}{1000+1996x1994}\)
\(=\frac{1996x1994+1000}{1000+1996x1994}\)
\(=1\)
1996 x 1995 - 1996 - 1996 x 1994 =
1996 x 1995 - 1996 x 1995 = 0
k cho mk nha!!