ta có : 1/3 +2/6 + 3/9 +4/12 +5/15 +6/18 =1/3 +1/3 +1/3 +1/3 +1/3 +1/3 =1/3*6=2

1/2+3/6+5/10+7/14+9/18+11/22

=0,5+0,5+0,5+0,5+0,5+0,5

=3

\(\frac{1}{2}+\frac{3}{6}+\frac{5}{10}+\frac{7}{14}+\frac{9}{18}+\frac{11}{22}=\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}=\frac{1}{2}.6=\frac{6}{2}=3\)

\(\frac{1}{2}+\frac{3}{6}+\frac{5}{10}+\frac{7}{14}+\frac{9}{18}+\frac{11}{22}\)

\(=\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}\)

\(=\frac{1}{2}×6\)

\(=\frac{1}{2}×\frac{6}{1}\)

\(=\frac{1×6}{2×1}\)

\(=\frac{6}{2}\)

\(=6:2\)

\(=3\)

1/3 + 2/6 3/9 + 4/12 + 5/15 + 6/18 = 2 nhé bạn

1/2 + 3/6 + 5/10 + 7/14 + 9/18 + 11/22

= 1/2 + ( 3/6=1/2) + (5/10=1/2) + (7/14 = 1/2) +( 9/18 =1/2) + (11/22 = 1/2)

= 1/2 + 1/2 + 1/2 + 1/2 + 1/2 + 1/2

= 1 + 1 + 1

= 3

\(\frac{1}{2}+\frac{3}{6}+\frac{5}{10}+\frac{7}{14}+\frac{9}{18}+\frac{11}{22}=\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}=\frac{1}{2}.6=\frac{6}{2}=3\)

1/2+3/6+5/10+7/14+9/18+11/22=3

1/11 + 2/11 + 3/11 + 4/11 + ........... + 10/11

= 1 + 2 + 3 + 4 + ........... + 10

= ( 10 - 1 ) : 1 + 1 = 10

= ( 10 + 1 ) x 10 : 2 = 55

= 55/11 = 5

tk nha. chuc bn hoc gioi

= 5 nhé bạn

5 cac ban nhe