Question

Đố:Đổi:0,999999999999999.....=0,(9) ra phân sô

Answer 1

A=0,9999999999....

=>10A=9,9999999999...

=>10A-A=9,999999999....-0,9999999999....

=>9A=9

=>A=1

=>0,(9)=1

Answer 2

=1              

Answer 3

ĐẶt 0,(9) = A

10A = 9,(9) = 9 + 0,(9)

10A - A = 9 + 0,(9)  - 0, (9 )

9A        = 9

A = 1

Answer 4

 0,99999... =9 x 0,11111... = 9 x \(\frac{1}{9}\) = \(\frac{9}{9}\)

Vậy 0.9999...=\(\frac{9}{9}\)

Answer 5

1 nhé bạn k nha