x+7/2015 + x+8/2014 + x+9/2013 + x+10/2012+ x+11/2011 + 5=0

1 bình luận về “x+7/2015 + x+8/2014 + x+9/2013 + x+10/2012+ x+11/2011 + 5=0”

1. (x+7)/2015 + (x+8)/2014 + (x+9)/2013 + (x+10)/2012+ (x+11)/2011 + 5=0

   =>((x+7)/2015+1) + ((x+8)/2014+1) + ((x+9)/2013+1) + ((x+10)/2012+1)+ ((x+11)/2011 + 1)=0

   =>((x+7)/2015+2015/2015) + ((x+8)/2014+2014/2014) + ((x+9)/2013+2013/2013) + ((x+10)/2012+2012/2012)+ ((x+11)/2011 + 2011/2011)=0

   =>(x+2022)/2015 + (x+2022)/2014 + (x+2022)/2013 + (x+2022)/2012+ (x+2022)/2011=0

   =>(x+2022).(1/2015+1/2014+1/2013+1/2012+1/2011)=0

   Mà 1/2015+1/2014+1/2013+1/2012+1/2011ne0

   =>x+2022=0

   =>x=-2022

   Vậy x=-2022

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