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2014-05-09T10:26:36+03:00
Ma=(a+b)/2
(a+3.5)/2=42.5
a+3.5=85
a=85-3.5
a=81.5
1 5 1
2014-05-09T10:38:29+03:00


ma=a+b/2

ma=42,5

b=3,5

42,5=a+3,5/2

42,5*2=a+3,5

85=a+3,5

⇒a=85-3,5

⇒a=81,5