12 + 23 + 45 + 67 + 16 + 18 + 45 = 226
If you mean 125+23+45 then it is 193
23 - 45 + 17 = -5
45 + 8 - 23 + 2 = 32
45
68
45
45
It doesn't, it should equal 45 again. I am unsure how you got this second answer but it is wrong
-45 plus 512 plus 45 plus 56 = 568
23/27 ÷ 45 = 23/27 ÷ 45/1 = 23/27 × 1/45 = (23×1)/(27×45) = 23/1215
Assuming that there is a "plus" after the second 58, the answer is - the associative property of addition.