\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+......+\frac{1}{y}-\frac{1}{y+1}\)
\(=1-\frac{1}{y+1}\)
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\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+......+\frac{1}{y}-\frac{1}{y+1}\)
\(=1-\frac{1}{y+1}\)
Thiếu đề nha bạn
1/1.2+1/2.3+1/3.4+...+1/X.(X+1)=10/11 (tìm X
1/1.2 + 1/2.3 + 1/3.4 + ... + 1/2003.2004 = ?
1/1.2+1/2.3+1/3.4+...+1/110.111 =?
1/1.2+1/2.3+1/3.4+...1/100.101
1/1.2+1/2.3+1/3.4+1/4.5+1/5.6 = ?
1/1.2 + 1/2.3 + 1/3.4 +...............+1/n(n+1)
A=1/1.2+1/2.3+1/3.4+1/4.5+....+1/2018.2019
tìm x trong biểu thức sau
(1/1.2=1/2.3+1/3.4+.....+1/8.9=1/9.10).100-[5/2:(x+206/100)]:1/2=89
[1/1.2+1/2.3+1/3.4+..............+1/19.20];x=9/10