Question

Chứng minh:      \(0,\left(12\right)+0,\left(87\right)=1\)

Answer 1

`0,(12)+0,(87)`

`= 0,(01). 12+0,(01). 87`

`= 0,(01).(12+87)`

`= 0,(01).99`

`= 1`

Answer 2

\(=0,\left(01\right)\times12+0,\left(01\right)\times87\)

\(=0,\left(01\right)\times\left(12+87\right)\)

\(=\dfrac{1}{99}\times99\)

\(=1\) ( đpcm) 

 

Answer 3

\(0,\left(12\right)+0,\left(87\right)\)

\(=0,12121212...+0,87878787...\)

\(=\dfrac{12}{99}+\dfrac{87}{99}=\dfrac{99}{99}=1\)

Answer 4

Answer 5

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