помогите с 1ым и 2ым пожалуйста

1) (1.68:1.6-2.1)(-1 2/3)-2 1/6 =
= (1,05-2.1)(-1 2/3) - 2 1/6 = 
= -1,05*(-1 2/3) - 2 1/6 =
= 1 1/20 * 1 2/3 - 2 1/6 = 
= 21/20 * 5/3 - 13/6 = 
= 7/4 - 13/6 = 21/12 - 26/12 = -5/12

2) (√16)³ - 51⁰ - 3² * 3⁻⁴ - 2:2⁻³ = 
= 4³ - 1 - 3⁻² - 1:2⁻² = 
= 64 - 1 - 1/9 - 1/4 = 
= 63 - 4/36 - 9/36 =
= 63 - (4/36 + 9/36) =
= 63 - 11/36 = 
= 62 25/36