1+2-3-4+5+6-7-8…… -1983-1984+1985+1986=? This question 1 + 2-3-4 + 5 + 6-7-8 -The calculation process and results of 1983-1984 + 1985 + 1986 are given by the disjunction formula
The original formula is 1 + (2-3-4 + 5) + (6-7-8 + 9) + (1982-1983-1984 + 1985) + 1986
=1+0+0.+1986
=1987
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