Question

(x/1*3)+(X/3*5)+(X/5*7)+……+X/2003*2005=1002 求X的值

Answer 1

x*(1/1*3+1/3*5+.+1/2003*2005)=1002

x*1/2*[(1/1-1/3)+(1/3-1/5)+.(1/2003-1/2005)]=1002

x*(1-1/2005)=2004

x=2005