Question

[Trần Anh]

Cho .
Khi đó  = 

Answer 1

[Hà Văn Cảnh]

hinh nhu la 0

Answer 2

[Vo Thanh Anh]

C=\(\frac{1}{100}-\left(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{99.100}\right)=\frac{1}{100}-\left(1-\frac{1}{100}\right)=\frac{1}{100}-\frac{99}{100}=\frac{-98}{100}\)

Suy ra 50C=-196