6 - 1 9/12 3 + 3/6 7/21= 6 - 1 3/4 3 + 1/2 7/21= 6 - 1 3/4 3 + 1/2 1/3= 6 - 1 3/4 * 3 + 1/6= 6 - 1 9/4 + 1/6= 6 - 4 9/4 + 1/6= 1 21/4 + 1/6= 5 9/4 + 1/6= 6 3/4 + 1/6= 7
(3/4)³ = (3³)/(4³) = 27/64
6 - 1 9/12 3 + 3/6 7/21
= 6 - 1 3/4 3 + 1/2 7/21
= 6 - 1 3/4 3 + 1/2 1/3
= 6 - 1 3/4 * 3 + 1/6
= 6 - 1 9/4 + 1/6
= 6 - 4 9/4 + 1/6
= 1 21/4 + 1/6
= 5 9/4 + 1/6
= 6 3/4 + 1/6
= 7
(3/4)³ = (3³)/(4³) = 27/64