Toán 6

P

pipilove_khanh_huyen

bạn nhớ tks cho mình nhé ^^!!

câu hỏi:1/2^2+1/3^2+1/4^2+.....+1/n^2
M=1/2^2+1/3^2+1/4^2+.....+1/n^2
M= 1/2.2+1/3.3+1/4.4+1/5.5+........+1/n.n
=> M< 1/1.2+1/2.3+1/3.4+...........+1/(n-1).n
=> M< 1-1/2+1/2-1/3+1/3-1/4+........+1/(n-1) -1/n
=> M< 1-1/n
=> M<(n-1)/n
M<1
 
You must log in or register to reply here.
Top Bottom