Question

помогите решить 2 и 3 пж

Answer 1

2.
А={-2,-1,0,1,2}
B={-3,-2,-1,0,1,2,3}.
A⊂B.
3.
1) 1, 1/2 + 2, 2/3 = 3,7/6 = 4,1/6 = 25/6.
2)25/6 : 15/8 = 20/9.
3) 5/6 - 7/8 = - 1/24.
4)-1/24 : 80/3 = -10/9.
5) 20/9 : (-10/9) = -2. 
-2∈Z, -2∈Q,-2∉N.