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\(\dfrac{99}{100}=1-\dfrac{1}{100}\)
\(\dfrac{100}{99}=1+\dfrac{1}{99}\)
\(\dfrac{100}{99}>\dfrac{99}{100}\)
xin TICH. chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(\dfrac{27}{86}\) < \(\dfrac{27}{81}\) = \(\dfrac{1}{3}\) = \(\dfrac{9}{27}\) < \(\dfrac{25}{27}\)
Vậy \(\dfrac{27}{86}\) < \(\dfrac{25}{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(\frac{1313}{1515}=\frac{13\times101}{15\times101}=\frac{13}{15}\)
\(\frac{1326}{1428}=\frac{1326:102}{1428:102}=\frac{13}{14}\)
DO \(\frac{13}{14}>\frac{13.}{15}\) nên \(\frac{1326}{1428}>\frac{1313}{1515}\)
\(b\))\(\frac{222}{555}\) và \(\frac{333}{444}\)
\(\frac{222}{555}=\frac{2\times111}{5\times111}=\frac{2}{5}\)
\(\frac{333}{444}=\frac{3\times111}{4\times111}=\frac{3}{4}\)
DO \(\frac{2}{5}< \frac{3}{4}\) nên \(\frac{222}{555}< \frac{333}{444}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(\dfrac{1119}{1999}=1-\dfrac{880}{1999}\)
\(\dfrac{1999}{2000}=1-\dfrac{1}{2000}\)
Mà: \(\dfrac{1}{2000}< \dfrac{880}{1999}\)
\(\Rightarrow1-\dfrac{880}{1999}< 1-\dfrac{1}{2000}\)
\(\Rightarrow\dfrac{1119}{1999}< \dfrac{1999}{2000}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
So sánh phân số bằng phân số trung gian
Vì \(\dfrac{1973}{2010}\) > \(\dfrac{1973}{2011}\) > \(\dfrac{1969}{2011}\)
Vậy \(\dfrac{1973}{2010}\) > \(\dfrac{1969}{2011}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
13/11 > 11/11 => 13/11 >1 (1)
8/9 < 9/9 => 8/9 <1 (2)
Từ (1) và (2) => 13/11 > 8/9
tích cho mk nha !!!!!!!~~~~~
96/104 = 1 - 8/104
94/102 = 1 - 8/102
Do 102 < 104 ⇒ 8/104 < 8/102
⇒ 1 - 8/104 > 1 - 8/102
Vậy 96/104 > 94/102
Rút gọn ta được:
\(\dfrac{96}{104}=\dfrac{12}{13};\dfrac{94}{102}=\dfrac{47}{51}\)
Quy đồng:
\(\dfrac{12}{13}=\dfrac{612}{663};\dfrac{47}{51}=\dfrac{611}{663}\)
So sánh: \(\dfrac{612}{663}>\dfrac{611}{663}\)
Vậy \(\dfrac{96}{104}>\dfrac{94}{102}\).