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Anggap:
x = 0,444...
10x = 4,444...
Kuragi:
10x = 4,444...
x = 0,444... -
Menjadi:
9x = 4
x = 4/9
Sehingga:
0,444... = 4/9
Menyebabkan:
√0,444...
= √4/9
= 2/3