the answer of 2 and 2 is 4, not 5
2-4, 3-2, 4-5, 4-4, 5-5
2 ÷ 4/5 = 5/2 or 21/2
It is {1, 2, 2, 4, 4, 4, 4, 5, 5, 5, 5, 5, 9, 12}
There are 64 subsets, and they are:{}, {A}, {1}, {2}, {3}, {4}, {5}, {A,1}, {A,2}, {A,3}, {A,4}, {A,5}, {1,2}, {1,3}, {1,4}, {1,5}, {2,3}, {2,4}, {2,5}, {3,4}, {3, 5}, {4,5}, {A, 1, 2}, {A, 1, 3}, {A, 1, 4}, {A, 1, 5}, {A, 2, 3}, {A, 2, 4}, {A, 2, 5}, {A, 3, 4}, {A, 3, 5}, {A, 4, 5}, {1, 2, 3}, {1, 2, 4}, {1, 2, 5}, {1, 3, 4}, {1, 3, 5}, {1, 4, 5}, {2, 3, 4}, {2, 3, 5}, {2, 4, 5}, {3, 4, 5}, {A, 1, 2, 3}, {A, 1, 2, 4}, {A, 1, 2, 5}, {A, 1, 3, 4}, {A, 1, 3, 5}, {A, 1, 4, 5}, {A, 2, 3, 4}, {A, 2, 3, 5}, {A, 2, 4, 5}, {A, 3, 4, 5}, {1, 2, 3, 4}, {1, 2, 3, 5}, {1, 2, 4, 5}, {1, 3, 4, 5}, {2, 3, 4, 5}, {A, 1, 2, 3, 4}, {A, 1, 2, 3, 5}, {A, 1, 2, 4, 5}, {A, 1, 3, 4, 5}, {A, 2, 3, 4, 5}, {1, 2, 3, 4, 5} {A, 1, 2, 3,,4, 5} .
10 + 10 5 + 5 + 5 + 5 4 + 4 + 4 + 4 + 4 2+2+2+2+2+2+2+2+2+2
2 and 4/5 = 2 + 4/5:= (10 + 4)/5= 14/5
2-2, 2-5, 4-2, 5-4, 5-2, 5-2, 5-2
(4/5)/2 = 4/10 = 2/5
5-1 5-1 2-1 4-5 or 4-5 2-1 5-1 5-1
4 and 2/5 2/5 = 0.4 Hence 4 and 2/5 is 4.4
(-5)*(-4) / [(-7) + 2] = (-5)*(-4)/(-5) = (-4) or -4.
-2 / (4/5) = -2*(5/4) = -5/2