Question

So sánh :

a) \(\frac{27}{35}\) và   \(\frac{21}{40}\)

b) \(\frac{27}{67}\)và  \(\frac{51}{152}\)

Answer 1

a) 27/35 > 27/40> 21/40 => 27/35>21/40

Answer 2

a) \(\frac{27}{35}=\frac{27\cdot8}{35\cdot8}=\frac{216}{280}\)và\(\frac{21}{40}=\frac{21\cdot7}{40\cdot7}=\frac{147}{280}\)nên\(\frac{27}{35}>\frac{21}{40}\)

b)Ta thấy phân số \(\frac{27}{67}\)và\(\frac{51}{152}\)~\(\frac{1}{2.5}\)và\(\frac{1}{3}\)nên\(\frac{27}{67}>\frac{51}{152}\)