1 + 3 – 5 -7 + 9 + 11 -……..- 397 – 399.tính hợp lí

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1 + 3 – 5 -7 + 9 + 11 -……..- 397 – 399.tính hợp lí

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Liliana 5 tháng 2021-07-15T09:46:01+00:00 1 Answers 7 views 0

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    2021-07-15T09:47:05+00:00

    1 + 3 – 5 -7 + 9 + 11 -……..- 397 – 399

    =(1+3-5-7)+…+(393+395-397-399)

    =(-8)+…+(-8)

    =(-8)×50

    =-400

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