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

Toán Lớp 6: x+5/2015+x+6/2014+x+7/2013+x+8/2012+x+8/2012+x+9/2011

Toán Lớp 6: x+5/2015+x+6/2014+x+7/2013+x+8/2012+x+8/2012+x+9/2011

Comments ( 1 )

  1. Giải đáp:
     ↓↓↓
    Lời giải và giải thích chi tiết:
     Hình như đề sai nên mk sửa lại nha . Nếu mk sửa sai thì tus có thể bình luận ở dưới nha ( mong mod ko xoá ) 
    \frac{x+5}{2015}+\frac{x+6}{2014}+\frac{x+7}{2013}+\frac{x+8}{2012}+\frac{x+9}{2011}=5
    (\frac{x+5}{2015}+1)+(\frac{x+6}{2014}+1)+(\frac{x+7}{2013}+1)+(\frac{x+8}{2012}+1)+(\frac{x+9}{2011}+1)=5-5
    \frac{x+5+2015}{2015}+\frac{x+6+2014}{2014}+\frac{x+7+2013}{2013}+\frac{x+8+2012}{2012}+\frac{x+9+2011}{2011}=0
    \frac{x+2020}{2015}+\frac{x+2020}{2014}+\frac{x+2020}{2013}+\frac{x+2020}{2012}+\frac{x+2020}{2011}=0
    (x+2020).(\frac{1}{2015}+\frac{1}{2014}+\frac{1}{2013}+\frac{1}{2012}+\frac{1}{2011})=0
    x+2020=0 ( do B khác 0) 
    → x=-2020        

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

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