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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: tìm x biết : x+2x+3x+4x=+-.+2011x=2012.2013

Toán Lớp 6: tìm x biết : x+2x+3x+4x=+…..+2011x=2012.2013

Comments ( 2 )

  1.  x + 2x + 3x + 4x + … + 2011x = 2021.2013
    => x( 1+2+3+4+ … + 2011  ) = 2021 . 2013
    => x( \frac{(1+2011)[(2011-1):1+1]}{2} ) = 2021 . 2013
    => x . 2023066 = 4068273
    => x = \frac{4068273}{2023066}
     

  2. x+2x+3x+4x+…+2011x=2021.2013
    =>x(1+2+3+4+…+2011)=2021.2013
    -Dãy số từ nhiên bắt đầu từ 1→$2011$ luôn có $2011$ số hạng
    =>x((2011+1).2011:2)=2021.2013
    =>x(2021.2011:2)=2012.2013
    =>x=(2021.2013)/((2012.2011):2)
    =>x=(4068273)/(4046132:2)
    =>x=(4068273)/(2023066)

    toan-lop-6-tim-biet-2-3-4-2011-2012-2013

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222-9+11+12:2*14+14 = ? ( )

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