Question

Aflati nr natural x: x+2x+3x..........100x=10100

Answer 1

x+2x+3x+...+100x= x ( 1+2+3+...+100)=x*100*101:2. x*101*100:2=10100. \ /100. x*101/2÷101 \ /101. x:2=1. x=2

Answer 2

x+2x+3x+...+100x= x ( 1+2+3+...+100)=x*100*101/2

x*101*100/2=10100. \ /100

x*101/2=101 \ /101

x/2=1

x=2

/ inseamna impartit
* inseamna inmultit