Question

[Trần Thị Thùy Linh]

1/8+1/24+1/48+1/80+1/120

giúp mình liền nhé

Answer 1

[Tu Anh vu]

Gọi A=\(\frac{1}{8}+\frac{1}{24}+\frac{1}{48}+\frac{1}{80}+\frac{1}{120}\)

     \(A=\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+\frac{1}{8.10}+\frac{1}{10.12}\)

   \(2A=\frac{2}{2.4}+\frac{2}{4.6}+\frac{2}{6.8}+\frac{2}{8.10}+\frac{2}{10.12}\)

   \(2A=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+...+\frac{1}{10}-\frac{1}{12}\)

  \(2A=1-\frac{1}{12}=\frac{11}{12}\)

   \(A=\frac{11}{12}:2=\frac{11}{24}\)

Answer 2

[Trần Thị Thùy Linh]

bạn ơi ban giúp mình câu này nhé

aa*ab=aab+ab