S1 = 1 + ( – 2 ) + 3 + (-4)+ ….+ 2001 + ( – 2002)

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S1 = 1 + ( – 2 ) + 3 + (-4)+ ….+ 2001 + ( – 2002)

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Clara 5 tháng 2021-07-15T11:03:03+00:00 2 Answers 2 views 0

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    0
    2021-07-15T11:04:44+00:00

    S1 = 1 + ( – 2 ) + 3 + (-4)+ ….+ 2001 + ( – 2002)

    ⇒S1=(1-2)+(3-4)+…+(2001-2002)

    ⇒S1=(-1)+(-1)+…+(-1)

    ⇒S1=(-1)×1001

    ⇒S1=-1001

    0
    2021-07-15T11:04:56+00:00

    S1 = 1 + 2 – 3 + 4 … + 2001 – 2002 ; (có 2002 số hạng)

    S1 = (1 – 2) + (3 – 4) + … + (2001 – 2002 ; (có 1001 cặp)

    S1 = (-1) + (-1) + … + (-1) = (-1) . 1001 = -1001

    => S1 = -1001

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