Răspunsuri

2014-05-13T15:37:31+03:00
2014-05-13T15:38:13+03:00
(10+x)²=(10-x)²+(10√2)²
100+20x+x^2=100-20x+x^2+200
20x=-20x+200
20x+20x=200
40x=200
x=200:40
x=5