b,
\(B=\frac{2018+2019}{2019+2020}=\frac{2018}{2019+2020}+\frac{2019}{2019+2020}\)
Ta thấy :
\(\frac{2018}{2019}>\frac{2018}{2019+2020}\)
\(\frac{2019}{2020}>\frac{2019}{2019+2020}\)
Từ đó , suy ra :
\(\frac{2018}{2019}+\frac{2019}{2020}>\frac{2018+2019}{2019+2020}\)
Vậy...
#Louis
Ta có :
\(\frac{205}{321}< \frac{205}{315}\)
\(\frac{214}{315}>\frac{205}{315}\)
\(\Leftrightarrow\frac{205}{321}< \frac{214}{315}\)
bn forever alone giai thich giup mk vs.tai sao lai the
~ Forever Alone ~ giải theo cách : so sánh phân số qua phân số trung gian
Cũng giống như bạn Cua Trôi - Trường Tồn nói, mk so sánh theo kiểu ps trung gian.
Ntn nè :
\(\frac{a}{b}< \frac{a}{c}\left(b>c\right)\)
\(\frac{d}{c}>\frac{a}{c}\left(d>a\right)\)
\(\Leftrightarrow\frac{a}{b}< \frac{d}{c}\)
