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2014-09-06T01:05:33+03:00
A) a=√8²+4²+1²=√81⇒ a=9.
b=√2,56= 1,6 (un nr zecimal, exact)

ma= (9+1,6):2
ma= 10,6:2
ma= 5,3 

b) 2x/3-5=1, aducem la acelasi numitor (3)
2x-15=3
2x=3+15
2x= 18⇒x= 18:2⇒x= 9
2 5 2