Question

3/2*3*4 + 3/3*4*5 + 3/4*5*6 +..............+ 3/100*101*102

giup minh ti minh dang can gap traong 1 tieng 

Answer 1

mk nghĩ câu hỏi này ko xứng tầm lớp 5 đâu!

Answer 2

\(\frac{3}{2.3.4}+\frac{3}{3.4.5}+...+\frac{3}{100.101.102}\)

\(=\frac{3}{2}\left(\frac{1}{2.3}-\frac{1}{3.4}+\frac{1}{3.4}-\frac{1}{4.5}+...+\frac{1}{100.101}-\frac{1}{101.102}\right)\)

\(=\frac{3}{2}\left(\frac{1}{6}-\frac{1}{101.102}\right)\)