4/8 can be simplified into 1/2. So 1/2 + 1/2 = 1
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It is: 1/3 plus 1/3 = 2/3
2/5 plus 1/3 plus 5/6 is equal to 1.57 or 1 57/100
2 minus 2/5 plus 1/2 minus 4 = -1.9
5/4
When you are using non-standard definitions of "plus" and "minus", or of "equal".