(-1) + 3 + (-5) + 7 + (-9) + … + x = 2002

Question

(-1) + 3 + (-5) + 7 + (-9) + … + x = 2002

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Margaret 5 tháng 2021-07-18T14:18:20+00:00 1 Answers 2 views 0

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    2021-07-18T14:20:11+00:00

    (-1)+3+(-5)+7+…+x=2002

    ⇒2+2+…+x=2002

    ⇒2×$(\frac{x-2}{2}+1):2$ =2002

    ⇒2×$(\frac{x-2}{2}+1)$=4004

    ⇒$(\frac{x-2}{2}+1)$=2002

    ⇒$\frac{x-2}{2}$=2001

    ⇒x-2=4002

    ⇒x=4003

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