2000-1990+1980-1970+1960-1950+…+20-10=?

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2000-1990+1980-1970+1960-1950+…+20-10=?2000-1990+1980-1970+1960-1950+…+20-10=?2000-1990+1980-1970+19

2000-1990+1980-1970+1960-1950+…+20-10=?
2000-1990+1980-1970+1960-1950+…+20-10=?

2000-1990+1980-1970+1960-1950+…+20-10=?
10·1000=10000