Question

1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 =

Answer 1

1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 = 3/8

các bạn hãy k và kb với mk nha

nếu ai thích k mk thì k cho mk thật nhiều nha

Answer 2

Đ/S: 3/8

Answer 3

Đ/S: 3/8

Answer 4

dễ quá

Answer 5

= 3/8 nha

Answer 6

ta có 1/6 + 1/12 + 1/20 + 1/42 + 1/56 = 1/2*3 + 1/3*4 + 1/4*5 + 1/5*6 + 1/6*7 + 1/7*8 = 1/2 - 1/3 + 1/3 - 1/4 + ...+ 1/7 - 1/8 = 1/2 - 1/8 = 3/8 

Answer 7

A*1/2= 1/12+1/24+1/40+...+1/112

A*1/2= 1/12-1/112= 25/336

A=25/168

Answer 8

A=25/168

Answer 9

1/6 + 1/12 + 1/20 + 1/30 + 1/42 +1/56

= ( 1/6 + 1/12 + 1/20 ) + ( 1/30 + 1/42 + 1/56 )

= 3/10    +     3/40

= 12/40 + 3/40

=  15/40 

= 3/8

Answer 10

\(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}=\frac{3}{8}\)