Răspuns :
18b
x+[tex]x-1+1+ \frac{x-1+2}{2} + \frac{x-1+3}{3} +....+ \frac{x-1+100}{100} =100[/tex][tex](x-1)+1+ \frac{x-1}{2} +1+ \frac{x-1}{3} +1+....+ \frac{x-1}{100} +1=100 [/tex]
(x-1)(1+1/2+1/2+....1/100)=0
x-1=0
x=1
x+[tex]x-1+1+ \frac{x-1+2}{2} + \frac{x-1+3}{3} +....+ \frac{x-1+100}{100} =100[/tex][tex](x-1)+1+ \frac{x-1}{2} +1+ \frac{x-1}{3} +1+....+ \frac{x-1}{100} +1=100 [/tex]
(x-1)(1+1/2+1/2+....1/100)=0
x-1=0
x=1