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\(=\dfrac{13}{17}\cdot\dfrac{17}{19}\cdot\dfrac{19}{13}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{121212}{141414}\times\frac{1313}{1212}\times\frac{2424}{2424}\)
\(=\frac{6}{7}\times\frac{13}{12}\times1\)
\(=\frac{13}{14}\)
~ Hok tốt ~
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\(\dfrac{1313}{1717}\) : \(\dfrac{1}{5}\) = \(\dfrac{13}{17}\) : \(\dfrac{1}{5}\) = \(\dfrac{65}{17}\)
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1313/1717 = 13/17
102102/109109 = 102/109
424242/535353 = 42/53
103103103/109109109 = 103/109
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Bài làm
\(\frac{1313}{1010}+x=\frac{1414}{2828}\)
\(\Rightarrow\frac{13}{10}+x=\frac{14}{28}\)
\(x=\frac{14}{28}-\frac{13}{10}\)
\(x=\frac{1}{2}-\frac{13}{10}\)
\(x=\frac{10}{20}-\frac{26}{20}\)
\(x=-\frac{16}{20}\)
\(x=-\frac{4}{5}\)
Vậy \(x=-\frac{4}{5}\)
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a)\(\Leftrightarrow\)\(x=\dfrac{2323}{4646}-\dfrac{1313}{2828}\)
\(\Leftrightarrow\)\(x=\dfrac{1}{28}\)
b)\(\Leftrightarrow\)\(x=\dfrac{23}{69}-\dfrac{17}{153}\)
\(\Leftrightarrow\)\(x=\dfrac{2}{9}\)
a) \(\dfrac{1313}{2828}\) + \(x\) = \(\dfrac{2323}{4646}\)
\(\dfrac{13}{28}\) + \(x\) = \(\dfrac{1}{2}\)
\(x=\dfrac{1}{2}-\dfrac{13}{28}\)
\(x=\dfrac{14}{28}-\dfrac{13}{28}\)
\(x=\dfrac{1}{28}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
1313/3737 rút gọn thành 13/37
13/37=0,(351)
1717/4141 rút gọn thành 17/41
17/41=0,(41463)
vì 0,(351)<0,(41463) suy ra 13/37<17/41
![](https://rs.olm.vn/images/avt/0.png?1311)
dễ mak duy = \(\frac{13}{45}\)
- CHO ANH K NHA!!!!!!!!!!!!!!!
a850/816
b2457/2106