Calculation: 11 × 4 + 14 × 7 + 17 × 10 + +12005×2008．

11×4+14×7+17×10+… +12005×2008=13（1-14）+13（14-17）+13（17-110）+… +13（12005-12008）=13（1-12008）=6692008．

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