Question

\(\dfrac{-3}{5}và\dfrac{-2}{7}\) tìm mẫu chung rồi so sánh

Answer 1

Ta có : \(-\dfrac{3}{5}=\dfrac{-21}{35}\);\(-\dfrac{2}{7}=-\dfrac{10}{35}\)

MT : 35 

=> \(-\dfrac{3}{5}< -\dfrac{2}{7}\)

Answer 2

\(\dfrac{-3}{5}=\dfrac{\left(-3\right)\times7}{5\times7}=\dfrac{-21}{35}\) ; \(\dfrac{-2}{7}=\dfrac{\left(-2\right)\times5}{7\times5}=\dfrac{-10}{35}\)

⇒ \(\dfrac{-3}{5}< \dfrac{-2}{7}\)

Answer 3

mẫu chung =35 ta có -21/35 và -10/35

vì -21/35 < -10/35

nên -3/5<2/7