ta có: -157/623=1-(780/623)
-47/213=1-(260/213)
ta thấy 260/213=780/639<780/623
=>1-260/213>1-780/623
=>-47/213>-157.623
ta có: -157/623=1-(780/623)
-47/213=1-(260/213)
ta thấy 260/213=780/639<780/623
=>1-260/213>1-780/623
=>-47/213>-157.623
Ta thấy : \(\frac{-157}{623}< \frac{-157}{213}< \frac{-47}{213}\)
Đáp số \(\frac{-157}{623}< \frac{-47}{213}\)