Cho \(M=\dfrac{1.3.5.7.....\left(2n-1\right)}{\left(n+1\right)\left(n+2\right)\left(n+3\right).....2n}\) với \(n\in\) N* .

Chứng minh rằng \(M< \dfrac{1}{2^{n-1}}\) 

Cho \(S=\dfrac{1}{31}+\dfrac{1}{32}+\dfrac{1}{33}+...+\dfrac{1}{60}\) .

Chứng minh rằng \(3< 5S< 4\) 

Give the correct form of the verbs in brackets.

1. He(feel) .................... hot and thirsty . He would like some cold water . 

2. Look! She (play) ................ football.

3. They (not ride) ............ a bicycle to school every day . They walk 

4. Lan is hungry . She would like (eat) ........... some noodles .

Các bạn giúp mk với , nhanh nha > < 

So sánh : \(A=\dfrac{2019^{2020}+1}{2019^{2019}-1}\) và \(B=\dfrac{2019^{2019}+1}{2019^{2018}-1}\)