Respuesta :

In its simplest form the answer is 9/20.
choixongdong
    x = 0.45¯
10x = 4.5¯
10x - x = 45.5¯ - 0.45¯
9x = 4.1
    x = 4.1 / 9
    x = 41 / 90

answer
41/90