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Nếu Có Thể

21/03/2017 at 17:13
Answers
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The provincial : 1.3 + 3.5 + 5.7 + ...... + 99.101

 



    List of answers
  • ...
    Lê Nho Khoa 25/03/2017 at 20:20

    Land : A = 1.3 + 3.5 + 5.7 + ...... + 99.101

    => 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

    => 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101

    => 4A = 99.100.101

    => A = 99.100.101/4

    => A = 249975

  • ...
    Nguyễn Việt Hoàng 21/03/2017 at 17:59

    Land : A = 1.3 + 3.5 + 5.7 + ...... + 99.101

    => 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

    => 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101

    => 4A = 99.100.101

    => A = 99.100.101/4

    => A = 249975

  • ...
    Trịnh Đức Phát 22/03/2017 at 12:38

    Put A = 1.3 + 3.5 + 5.7 + ...... + 99.101

    => 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

    => 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101

    => 4A = 99.100.101

    => A = 99.100.101/4

    => A = 249975

  • ...
    Lê Nho Khoa 23/03/2017 at 21:03

    Put A = 1.3 + 3.5 + 5.7 + ...... + 99.101

    => 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

    => 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101

    => 4A = 99.100.101

    => A = 99.100.101/4

    => A = 249975

  • ...
    Trịnh Đức Phát 22/03/2017 at 12:38

    Put : A = 1.3 + 3.5 + 5.7 + ...... + 99.101

    => 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

    => 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101

    => 4A = 99.100.101

    => A = 99.100.101/4

    => A = 249975

  • ...
    Phan Văn Hiếu 24/03/2017 at 13:13

    A=99.101.103/3=343299

  • ...
    Trịnh Đức Phát 22/03/2017 at 12:38

    Put A = 1.3 + 3.5 + 5.7 + ...... + 99.101

    => 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

    => 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.100.101

    => 4A = 99.100.101

    => A = 99.100.101/4

    => A = 249975



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