Question

[Duong ha linh]

Các ban ơi giúp minh voi :

Ban hay chứng tỏ rằng .  

a) 1/101 + 1/102 + ... +1/200 > 7/12

b) 1/151 + 1/152 + ... + 1/200 > 1/4

Answer 1

[soyeon_Tiểu bàng giải]

a) \(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\)

\(=\left(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{150}\right)+\left(\frac{1}{151}+\frac{1}{152}+...+\frac{1}{200}\right)>\frac{1}{150}\times50+\frac{1}{200}\times50\)

                                                                                                                    \(>\frac{1}{3}+\frac{1}{4}=\frac{7}{12}\)

b) \(\frac{1}{151}+\frac{1}{152}+...+\frac{1}{200}>\frac{1}{200}\times50=\frac{1}{4}\)

Answer 2

[nguyen thi lan huong]

a)\(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\)

=\(\left(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{150}\right)+\left(\frac{1}{151}+\frac{1}{152}+...+\frac{1}{200}\right)>\frac{1}{150}x50+\frac{1}{200}x50\)

\(>\frac{1}{3}+\frac{1}{4}=\frac{7}{12}\)

\(\frac{1}{151}+\frac{1}{152}+...+\frac{1}{200}>x50=\frac{1}{4}\)

Chúc bạn học tốt!