Question

[Phạm Ngọc Thạch]

Tìm số hữu tỉ x biết rằng : (x+4)/2011+(x+3)/2012=(x+2)/2013+(x+1)/2014

Answer 1

[Trần Thị Loan]

=> \(\left(\frac{x+4}{2011}+1\right)+\left(\frac{x+3}{2012}+1\right)=\left(\frac{x+2}{2013}+1\right)+\left(\frac{x+1}{2014}+1\right)\)

=> \(\frac{x+5}{2011}+\frac{x+2015}{2012}=\frac{x+2015}{2013}+\frac{x+2015}{2014}\)

=> \(\left(x+2015\right)\left(\frac{1}{2011}+\frac{1}{2012}-\frac{1}{2013}-\frac{1}{2014}\right)=0\)

=> x = -2015 Vì \(\frac{1}{2011}+\frac{1}{2012}-\frac{1}{2013}-\frac{1}{2014}\ne0\)