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

Toán Lớp 6: Tính tổng sau: A = 1+2-3-4+5+6-7-8+9+10– + 202-203-204+205

Toán Lớp 6: Tính tổng sau: A = 1+2-3-4+5+6-7-8+9+10-…. + 202-203-204+205

Comments ( 2 )

  1. A = 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10- …. + 202 – 203 – 204 + 205

    A = 1+[(2-3)+(-4+5)+(6-7)+(-8+9)+…+(202-203)+(-204+205)]

    A = 1+[-1+1+(-1)+1+…+(-1)+1]

    A =1

  2. Lời giải và giải thích chi tiết:

    $\textit{A = 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10 + … + 202 – 203 – 204 + 205}$

    $\textit{A = 1 + (2 – 3) + ( -4 + 5) + (6 – 7) + (-8 + 9) + 10 + … + (202 – 203) + (-204 + 205)}$

    $\textit{A = 1 + (-1) + 1 + (-1) + 1 + 10 + … + (-1) + 1}$

    $\textit{A = 1 + [(-1) + 1] + [(-1) + 1] + 10 + [(-1) + 1]}$

    $\textit{A = 1 + 0 + 0 + 10 + 0}$

    $\textit{A = 1 + (0 + 0 + 0) + 10}$

    $\textit{A = 1 + 0 + 10}$

    $\textit{A = 1 + 10}$

    $\textit{A = 11}$

    $\overline{nkbian}$

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

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