=1-1/3+1/2-1/3+1/3-1/4+....+1/99-1/100
=1-1/100
=99/100
ai kick mkmk kich lai 5 h
= 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/999 - 1/1000
= 1 - 1/1000
= 1000/1000 - 1 /1000
= 999/1000
\(\frac{1}{1.3}+\frac{1}{2.3}+\frac{1}{3.4}+.........+\frac{1}{99.100}\)
\(=1-\frac{1}{1000}\)
\(=\frac{1000}{1000}-\frac{1}{1000}\)
\(=\frac{999}{1000}\)
1/1.3+1/2,3+1/3,4+...+1/99.100
=1-1/100
=999/100
1-1/3+1/1/2-1/3+......+1/99-1/100
=1/100-1
=99/100
