1+2+2×2+2×3+2×4+2×5.+2×2012 完成给30分讲解.是1+2+2×2+2×3+2×4+2×5.+2×2012 不是 1+2×1.

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1+2+2×2+2×3+2×4+2×5.+2×2012完成给30分讲解.是1+2+2×2+2×3+2×4+2×5.+2×2012不是1+2×1.1+2+2×2+2×3+2×4+2×5.+2×2012完

1+2+2×2+2×3+2×4+2×5.+2×2012 完成给30分讲解.是1+2+2×2+2×3+2×4+2×5.+2×2012 不是 1+2×1.
1+2+2×2+2×3+2×4+2×5.+2×2012 完成给30分
讲解.是1+2+2×2+2×3+2×4+2×5.+2×2012 不是 1+2×1.

1+2+2×2+2×3+2×4+2×5.+2×2012 完成给30分讲解.是1+2+2×2+2×3+2×4+2×5.+2×2012 不是 1+2×1.
=1+2x(1+2+3+.+2012)
=1+2x((2012+1)x(2012/2))
=1+2x(2013x1006)
=4050157