Question

[Trần Huỳnh Anh Thư]

1. Tính

E=1/1.2+1/2.3+1/3.4+...1/49.50

2. Tìm x

x+1/6=x/3

Answer 1

[Nguyễn Hoàng Phúc]

1.Tính

\(E=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)

\(E=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{49}-\frac{1}{50}\)

\(E=\frac{1}{1}-\frac{1}{50}\)

\(E=\frac{49}{50}\)

Câu 2 mình không biết, xin lỗi nha

Answer 2

[Uchiha Sasuke]

E=1/1-1/2+1/2-1/3+1/3-1/4+...+1/49-1/50

  =1/1-1/50=49/50