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\(\frac{27}{31}=\frac{2727}{3131}=\frac{272727}{313131}\)
\(\frac{27}{31}=\frac{27.101}{31.101}=\frac{27.10101}{31.10101}\)
\(\frac{27}{31}=\frac{27}{31}=\frac{27}{31}\)
\(\Rightarrow\frac{27}{31}=\frac{2727}{3131}=\frac{272727}{313131}\)
\(\frac{27}{31}=\frac{2727}{3131}=\frac{272727}{313131}\)
\(\frac{27}{31}=\frac{27\cdot101}{31\cdot101}=\frac{27\cdot10101}{31\cdot10101}\)
\(\Rightarrow\frac{27}{31}=\frac{2727}{3131}=\frac{272727}{313131}\)
\(\dfrac{2727}{3131}=\dfrac{27.101}{31.101}=\dfrac{27}{31}\)
⇒\(\dfrac{27}{31}=\dfrac{2727}{3131}\)
\(\dfrac{27}{31}=\dfrac{27\times101}{31\times101}=\dfrac{2727}{3131}\)
`#3107.101107`
`a)`
Ta có:
\(\dfrac{2727}{3131}=\dfrac{2727\div27}{3131\div31}=\dfrac{27}{31}\)
Vì \(\dfrac{27}{31}=\dfrac{27}{31}\)
\(\Rightarrow\dfrac{27}{31}=\dfrac{2727}{3131}\)
`b)`
Ta có:
\(\dfrac{11}{31}=1-\dfrac{20}{31}=1-\dfrac{200}{310}\)
\(\dfrac{111}{311}=1-\dfrac{200}{311}\)
Vì \(\dfrac{200}{310}>\dfrac{200}{311}\)
\(\Rightarrow1-\dfrac{200}{310}< 1-\dfrac{200}{311}\)
\(\Rightarrow\dfrac{11}{31}< \dfrac{111}{311}.\)
\(a,\dfrac{2727}{3131}=\dfrac{2727:101}{3131:101}=\dfrac{27}{31}\\ Vậy:\dfrac{27}{31}=\dfrac{2727}{3131}\)
\(\dfrac{15}{31}=\dfrac{4485}{6169}\)
\(\dfrac{100}{299}=\dfrac{3100}{6169}\)
mà 4485>3100
nên \(\dfrac{15}{31}>\dfrac{100}{299}\)
\(\frac{139139}{420420}=\frac{139x1001}{420x1001}=\frac{139}{420}\)
\(\frac{313131}{878787}=\frac{31x10101}{87x10101}=\frac{31}{87}=\frac{135}{435}< \frac{135}{420}< \frac{139}{420}\)
\(\Rightarrow\frac{139139}{420420}>\frac{313131}{878787}\)
\(\frac{3}{5}\)và \(\frac{4}{9}\)
Vì \(\frac{3}{5}>\frac{3}{6}=\frac{1}{2};\frac{1}{2}=\frac{4}{8}>\frac{4}{9}\)nên \(\frac{3}{5}>\frac{4}{9}\)
\(\frac{19}{60}\)và \(\frac{31}{90}\)
Vì \(\frac{19}{60}< \frac{19}{57}=\frac{1}{3};\frac{1}{3}=\frac{31}{93}< \frac{31}{90}\)nên \(\frac{19}{60}< \frac{31}{90}\)
# Học tốt
So sánh :
\(\frac{18}{31}\)và \(\frac{15}{37}\)
Ta có : \(\frac{18}{31}\) > \(\frac{1}{2}\) > \(\frac{15}{37}\) nên \(\frac{18}{31}\) > \(\frac{15}{37}\)
\(\frac{27}{31}=\frac{27x10101}{31x10101}=\frac{272727}{313131}\)
27/31 = 272727/313131