Question

Tìm x biết: \(x+2x+3x+...+2013x=2013.2017\)

Answer 1

bằng 1 bạn nhé

Answer 2

x+2x+3x+.....+2013x=2013.2017

=>x.(1+2+3+.....+2013)=2013.2017

=>\(x.\frac{2013.\left(2013+1\right)}{2}=2013.2017\Rightarrow x.2027091=4060221\Rightarrow x=\frac{2017}{1007}\)

Answer 3

x+2x+3x+...+2013x=2013.2017

=>x(1+2+3+...+2013)=2013.2017
 

=>X\(\frac{2013\left(2013+1\right)}{2}=2027091=4060221\)

=>X.2027091=4060221

X=4060221:2027091=2017/1007