đó là : 1/4+1/6+1/12

\(\frac{7}{8}=\frac{1}{8}+\frac{6}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)

\(\frac{11}{12}=\frac{1}{12}+\frac{10}{12}=\frac{1}{12}+\frac{4}{12}+\frac{6}{12}=\frac{1}{12}+\frac{1}{3}+\frac{1}{2}\)

\(\frac{14}{24}=\frac{7}{12}=\frac{1}{12}+\frac{6}{12}=\frac{1}{12}+\frac{4}{12}+\frac{2}{12}=\frac{1}{12}+\frac{1}{3}+\frac{1}{6}\)

OK ban nhe

A LÀ 1/7,2/7,3/7,4/7,5/7

B LÀ 10/5,9/5,8/5,7/5,6/5

C LÀ 2/5,16/20,24/30,32/40,40/50

D LÀ 1/6,2/5,3/4,2/5/1/6

Ch0 em lam toan va tiêng viêt

1/4+1/6+1/12=1/2

Ta có :

\(\frac{7}{32}=\frac{1}{32}+\frac{1}{48}+\frac{1}{6}\)

7/32 = 1/32 + 1/48 + 1/6 nha e , cj hc lp 7 rùi , cj thik mở toán tiểu hc lên giải thoy àh , toán cấp 2 rối lắm e ơi , tk mk nha 

nhanh len nhe

1/2;1/3;1/5;1/10;1/15;1/30

ta thấy 6 chia hết cho:6;3:2:1

5/6=2/6+3/6=1/3+1/2

chúc bạn học giỏi

\(\frac{5}{6}=\frac{1}{6}+\frac{2}{3};\frac{5}{6}=\frac{2}{6}+\frac{1}{2}\)

Ta có :

\(\frac{5}{6}=\frac{1}{2}+\frac{1}{3}\)

1/36 + 1/16 + 1/8 + 1/4 + 1/2 = 31/32 

Tổng đó là: \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{31.32}\)

31/32 = 1/32 + 30/32

= 1/32 + 15/16

= 1/32 + 7/16 + 8/16

= 1/32 + 7/16 + 1/2

= 1/32 + 1/2 + 5/16 + 2/16

= 1/32 + 1/2 + 5/16 + 1/8

= 1/32 + 1/2 + 1/8 + 1/16 + 4/16

= 1/32 + 1/2 + 1/8 + 1/16 + 1/4