Question

bài 6: TÍNH NHANH NÂNG CAO LỚP 5

 A= 1/5+1/25+1/125+1/625+1/3125

   giải hộ mình nhanh nhanh nha các bạn

Answer 1

=781/3125

Answer 2

5A=(1/5+1/25+1/125+1/625+1/3125)*5

5A=(1+1/5+1/25+1/125+1/625)

5A-A=(1+1/5+1/25+1/125+1/625)-(1/5+1/25+1/125+1/625+1/3125)=1-1/3125

4A=1-1/3125=3124/3125

A=3124/3125:4=781/3125.

Answer 3

lớp 4 mÀ

Answer 4

`=>` Ta có:

`5A=(1/5+1/25+1/125+1/625+1/3125) xx 5`

`5A=(1+1/5+1/25+1/125+1/625)`

`5A-A=(1+1/5+1/25+1/125+1/625)-(1/5+1/25+1/125+1/625+1/3125)=1-1/3125`

`4A=1-1/3125=3124/3125

A=3124/3125:4=781/3125.