Question

x+2x+3x+4x+.......+50x=5325

Answer 1

<=> \(x\left(1+2+3+...+50\right)=5325\)

<=> \(x.\dfrac{\left(50+1\right).50}{2}=5325\)

<=> \(x.1275=5325\)

<=> ... bn tự lm nhé