`B=1/3+1/6+1/10+1/15+…+1/2021`

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`B=1/3+1/6+1/10+1/15+…+1/2021`

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Amity 5 years 2021-05-19T18:57:39+00:00 1 Answers 21 views 0

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  1. thanhcong
    0
    2021-05-19T18:58:40+00:00
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    =1/1.3+1/3.2+1/2.5+1/5.3+………+1/1010.1011

    =1.(1/1-1/3+1/3-1/2+1/2-1/5+1/5+…………….+1/1010-1011)

    =1.(1/1-1/-1)

    =1.(1.-1)

    =1.1

    =1

     

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )