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2014-11-14T15:15:07+02:00
Ma=(x+y):2

ma=[2(4 - √ 7)+2 √7]:2=(8-2 √7+2 √7):2=8:2=4




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2014-11-14T15:17:21+02:00
X=8-2√7
y=2√7
ma=x+y supra2 = 8-2√7+2√7supra 2 (+2√7-2√7 se reduc) 
ma= 8 supra 2= 4