Tính: (1 - 1/2) : (1 - 1/3) : (1 - 1/4) : (1 - 1/5) : (1 - 1/6), Tính: ( 1 - 1/2 ) × ( 1- 1/3 ) × ( 1 - 1/4 ) × ( 1 - 1/5 ) × ( 1 - 1/6 ), Tính: (1 - 1/2) * (1 - 1/3) * (1 - 1/4) * (1 - 1/5) * (1 - 1/6)