Question

tìm x

1/2013 *x+1+1/2+1/6+1/12+...+1/2012.2013=2

 

Answer 1

1/2013.x+1+1/2+1/6+1/12+...+1/2012.2013=2

1/2013.x+1+1/1.2+1/2.3+1/3.4+...+1/2012.2013=2

1/2013.x+1+1-1/2+1/2-1/3+1/3-1/4+...+1/2012-1/2013=2

1/2013.x+2-1/2013=2

1/2013.x                   =2-2+1/2013

1/2013.x                   =1/2013

=>2013.x=2013

=> x=1

Answer 2

\(\Rightarrow\frac{1}{2013.x}+1+1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+.....+\frac{1}{2012}-\frac{1}{2013}=2\)

\(\Rightarrow\frac{1}{2013.x}+2-\frac{1}{2013}=2\)

\(\Rightarrow\frac{1}{2013.x}=2-2+\frac{1}{2013}\)

\(\Rightarrow\frac{1}{2013.x}=\frac{1}{2013}\)

\(\Rightarrow2013.x=2013\)

\(\Rightarrow x=1\)