Răspunsuri

2014-04-08T22:42:27+03:00
X-3,x-1,x+1 sunt dp cu 3,4,5⇒

x-3/3=x-1/4=x+1/5=k
x-3=3k ⇔x=3k+3
x-1=4k ⇔x=4k+1
x+1=5k ⇔x=5k-1

3k+3=4k+1=5k-1
3k+3=5k-1
3k-5k=-1-3
-2k=-4
2k=4
k=2

x=3*2+3=6+3=9