Có: \(A=\frac{1}{2013}x\frac{2015}{2014}-\frac{2014}{2013}\)
\(=\frac{1}{2013}.\frac{2015}{2014}-\frac{1}{2013}.2014=\frac{1}{2013}.\left(\frac{2015}{2014}-2014\right)\)
À xin lỗi Nguyễn Thị Thuý Ngân nhé,mik ghi sai đề bài ,đáng lẽ phải là:\(\frac{1}{2013.2014}+\frac{2015}{2014}\)-\(\frac{2014}{2013}\)
1/(2013.2014)+ 2015/2014 - 2014/2013
= 1/(2013.2014) + [(2015.2013)/(2014.2013) - 20142/2014.2013]
= 1/(2013.2014) - 1/(2013.2014)
=0