Question

1/1.2 + 1/2.3 + 1/3.4 + ....+ 1/9.10

Answer 1

\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\)\(\frac{1}{9.10}\)

\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}\)\(...+\frac{1}{9}-\frac{1}{10}\)

\(=1-\frac{1}{10}\)

\(=\frac{9}{10}\)

ủng hộ mik nha mn

Answer 2

=1-1/2+1/2-1/3+1/3-1/4+....+1/9-1/10

=1-1/10

=9/10

Em chao anh anh ket ban voi em nhe

Answer 3

=1-1/2+1/2-1/3+1/4-1/5+1/5-1/6+....+1/9-1/10

=1-1/10=9/10

KET BAN VOI EM NHE