Ta lấy \(\dfrac{-17}{85}\) làm ps trung gian. (nếu lớp 7 chắc bn cũng học r)
So sánh \(\dfrac{-17}{35};\dfrac{-17}{85}\&\dfrac{-43}{85}\)
Ta thấy: \(\dfrac{-17}{35}>\dfrac{-17}{85}\) mà \(\dfrac{-17}{85}>\dfrac{-43}{85}\Rightarrow\dfrac{-17}{35}>\dfrac{-17}{85}>\dfrac{-43}{85}\)
\(\Rightarrow\dfrac{-17}{35}>\dfrac{-43}{85}\)