巧算:2000-1997+1994-1991+1988-1985+1982-1979+...+14-11+8-5+2

问题描述:

巧算:2000-1997+1994-1991+1988-1985+1982-1979+...+14-11+8-5+2

原式={[(2000-2)/3]/2}*3+2 =333*3+2 =999+2 =1001
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