Question

So sánh

A= 2018+ 2019 / + 2019 +2020 và B = 2018/2019 +2019/2020

kb nhé mn 

NMD ♡♡♡♡

Answer 1

Trả lời

Chắc chắn A > B rồi !

HIHI hok tốt !

Answer 2

Ta có:

\(A=\frac{2018+2019}{2019+2020}=\frac{2018}{2019+2020}+\frac{2019}{2019+2020}\)

mà 2019+2020 >2019>2020 \(\Rightarrow\frac{2018}{2019+2020}< \frac{2018}{2019};\frac{2019}{2019+2020}< \frac{2019}{2020}\) 

\(\Rightarrow\frac{2018}{2019+2020}+\frac{2019}{2019+2020}< \frac{2018}{2019}+\frac{2019}{2020}\)hay \(A< B\)

Answer 3

A = 2018+2019/2019 + 2020 

= \(\frac{2019+2020-2}{2019+2020}\) = 1 - \(\frac{2}{2019+2020}\)< 1

Có 2018/2019 > 1/2

2019/2020 >1/2

=> B = 2018/2019 + 2019/2020 > 1/2 + 1/2 = 1.

Vậy B > A