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(10+x)²=(10-x)²+(10√2)²

Răspuns :

100+20x+x²=100-20x+x²+200
40x=200
x=5
(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