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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: x^2006-8*x^2005+8*x^2004-…+8*x^2-8*x-5

Toán Lớp 8: x^2006-8*x^2005+8*x^2004-…+8*x^2-8*x-5

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    x^2006-8x^2005+8x^2004-…+8x^2-8x-5
    x^2006-(x+1)x^2005+(x+1)x^2004-…+(x+1)x^2-(x+1)x-5
    =x^2006-x^2006-x^2005+x^2005+x^2004-…..+x^3+x^2-x^2-x-5
    =7^3-7^2-7^2-7-5
    = 49-49-7-5
    =-7-5
    =-12
    @HaiZZZ@

  2. x^2006-8.x^2005+8.x^2004-…+8*x^2-8.x-5
    ⇔x^2006-x^2006-x^2005+x^2005+x^2004-…x^3+x^2-x^2-x-5
    ⇔7^3-7^2-7^2-7-5
    ⇔(343-49-49)-7-5
    ⇔245-7-5
    ⇔233
    text{Xin hay nhất nhé!!!Bạn kia sai 2 dòng cuối.}

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222-9+11+12:2*14+14 = ? ( )