373737/474747=37x10101/47x10101=37/47

123123/246246=123x1001/246x1001=123/246=1/2

vì 37/47> 1/2 nên 373737/474747> 123123/246246

a, Ta có \(\frac{3838}{8383}=\frac{3838\div101}{8383\div101}=\frac{38}{83}\)

\(\frac{383838}{838383}=\frac{383838\div10101}{838383\div10101}=\frac{38}{83}\)

Vì \(\frac{38}{83}=\frac{38}{83}\)nên \(\frac{3838}{8383}=\frac{383838}{838383}\)

b, \(\frac{3838}{8383}=\frac{38383\div101}{8383\div101}=\frac{38}{83}=1-\frac{45}{83}\)

\(\frac{2014}{2016}=\frac{2014\div2}{2016\div2}=\frac{1007}{1008}=1-\frac{1}{1008}=1-\frac{45}{45360}\)

Vì \(\frac{45}{83}>\frac{45}{45360}\)nên \(1-\frac{45}{83}< 1-\frac{45}{45360}\)hay \(\frac{38}{83}< \frac{1007}{1008}\)suy ra \(\frac{3838}{8383}< \frac{2014}{2016}\)

Ta có: 3838/8383 = 383838/838383  vì 3838/8383 = 38/83 = 383838/838383

Ta có:
\(\dfrac{3434}{7878}=\dfrac{3434:202}{7878:202}=\dfrac{17}{39}\)
\(\Rightarrow\dfrac{3434}{7878}< \dfrac{20}{39}\)
\(-------\)
Ta có:
\(\dfrac{123123}{405405}=\dfrac{123123:1001}{405405:1001}=\dfrac{123}{405}\)
\(\Rightarrow\dfrac{123123}{405405}>\dfrac{123}{1109}\)
\(---------\)
Ta có:
\(\dfrac{666666}{323232}=\dfrac{666666:80808}{323232:80808}=\dfrac{8,25}{4}\)
\(\Rightarrow\dfrac{666666}{323232}< \dfrac{25}{4}\)

\(\dfrac{212121}{232323}=\dfrac{212121:10101}{232323:10101}=\dfrac{21}{23}\)

\(\dfrac{123123}{124124}=\dfrac{123123:1001}{124124:1001}=\dfrac{123}{124}\)

Ta có: \(1-\dfrac{21}{23}=\dfrac{2}{23}\) ; \(1-\dfrac{123}{124}=\dfrac{1}{124}=\dfrac{2}{248}\)

\(=>\dfrac{2}{23}>\dfrac{2}{248}\)

\(=>1-\dfrac{21}{23}>1-\dfrac{123}{124}\)

\(=>\dfrac{21}{23}< \dfrac{123}{124}\)

\(=>\dfrac{212121}{232323}< \dfrac{123123}{124124}\)

ps thứ 1 rút gọn cả tử lẫn mẫu cho1001001

ps thứ 2 rút gnj cả tử và mẫu cho 1001

đúng thì k nhé

\(\frac{123123123}{719719719}=\frac{123}{719}\)(rút gọn cho 1001001)

\(\frac{123123}{719719}=\frac{123}{719}\)(rút gọn cho 1001)

\(\Rightarrow\frac{123123123}{719719719}=\frac{123123}{719719}\)

123123123 / 719719719 = 123 x 1001001 / 719 x 1001001 = 123/719

123123 / 719719 = 123 x 1001 / 719 x 1001 = 123/719

Vì 123/719 = 123/719

nên 123123123 / 719719719 = 123123 / 719719

252525 / 383838 = 25 / 38.

\(\frac{252525}{383838}=\frac{252525:10101}{383838:10101}=\frac{25}{38}\)

25/38

Tớ chắc chắn

Ta thấy:

      123123 × 456 = 123 × 1001 × 456

      456456 × 123 = 456 × 1001 × 123

       Do đó: 123123 × 456 = 456456 × 123

123123.456 và 456456.123

123123/1001 = 123

456456/1001= 456

123.456 và 456.123 là bằng nhạu

ket qua la 123123x456 lon hon ban nhe

Ta có:

123123=123.1001

=>123123.456=123.1001.456 (1) 

 456456=456.1001

=>456456.123=456.1001.123 (2)

Từ (1) ,(2)=>123123.456=456456.123

K mình nhé!