要简便算式)越快越好啊3000-2-4-6-8-10-...-34-361990+1991-1992-1993+1994+1995-1996-1997+1998+1999(1×1+2×2+3×3+...+10×10)-(1×2+2×3+...+9×10)
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![要简便算式)越快越好啊3000-2-4-6-8-10-...-34-361990+1991-1992-1993+1994+1995-1996-1997+1998+1999(1×1+2×2+3×3+...+10×10)-(1×2+2×3+...+9×10)](/uploads/image/z/3726827-35-7.jpg?t=%E8%A6%81%E7%AE%80%E4%BE%BF%E7%AE%97%E5%BC%8F%EF%BC%89%E8%B6%8A%E5%BF%AB%E8%B6%8A%E5%A5%BD%E5%95%8A3000-2-4-6-8-10-...-34-361990%2B1991-1992-1993%2B1994%2B1995-1996-1997%2B1998%2B1999%EF%BC%881%C3%971%2B2%C3%972%2B3%C3%973%2B...%2B10%C3%9710%EF%BC%89-%EF%BC%881%C3%972%EF%BC%8B2%C3%973%2B...%2B9%C3%9710%EF%BC%89)
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