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2014-07-27T11:50:07+03:00
1+2+3+.....+100=(1+100)*100:2=101*50=5050
x+x+x+....+x+x(de 101 ori)+5050=5151
101x=5151-5050⇒101x=101⇒x=101:101=1
Raspuns:x=1
2 5 2
2014-07-27T11:51:13+03:00
[x+(x+100)]*101/2= 5151

(x+x+100)*101=5151*2

(2x+100)*101= 10302

2x+100=10302 :101

2x+100= 102

2x=102-100

2x=2

x=1
1 5 1