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2014-04-25T15:03:06+03:00
 (S1+S2+S3+S4+S5+S6+S7+S8):8=38
 afli suma celor opt suprafete S1+S2+S3+S4+S5+S6+S7+S8=304
 aplici faptul ca media aritmetica a primelor patru suprafete este 29 :  S1+S2+S3+S4=29*4=156
 S5+S6+S7+S8+156=304
S5+S6+S7+S8=304-156
afli suma utimelor partu suprafete S5+S6+S7+S8=148
 calculezi media aritmetica(S5+S6+S7+S8):4=148:4=37