6/15+6/35+6/63+6/99+6/143

Question

6/15+6/35+6/63+6/99+6/143

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Ladonna 8 months 2021-05-23T19:04:45+00:00 2 Answers 10 views 0

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    0
    2021-05-23T19:05:49+00:00

    6/15+6/35+6/63+6/99+6/143

    =3(2/15+2/35+2/63+2/99+2/143)
    =3(2/3.5+2/5.7+2/7.9+2/9.11+2/11.13)

    =3(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13)

    =3(1/3-1/13)

    =3.10/39=10/13

    0
    2021-05-23T19:06:22+00:00

    6/15+6/35+6/63+6/99+6/143

    =6/3.5+6/5.7+6/7.9+6/9.11+6/11.13

    =3.(2/3.5+2/5.7+2/7.9+2/9.11+2/11.13)

    =3.(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13)

    =3.10/39

    =10/13

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