Question

Cần bn giúp mk nhanh TICK NHANH CHO

Answer 1

b, \(=\dfrac{99}{100}.\dfrac{98}{99}...\dfrac{1}{2}=\dfrac{1}{100}\)

c, \(=1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{99}-\dfrac{1}{100}=1-\dfrac{1}{100}=\dfrac{99}{100}\)

Answer 2

- Tick bằng niềm tin ấy bạn :)

a) (100-9)(99-9)(98-9)...(1-9)=(100-9)(99-9)(98-9)...(9-9)...(1-9)=0