Question

Represent 0.9bar as rational number

Answer 1

let x=0.9bar
=> 10x=9.9bar
=> 10x=9+0.9bar
=> 10x=9+x
=> 9x=9
so x= 1
so 0.9bar =1 proved that 0.9 bat is rational

Answer 2

Answer:

❤Refer to this picture