Question

Ex1.Calculati media aritmetica a numerelor:3 si 11;4 si 56;202 si38;0 si 38;31 si 53;2011 si2009;447 si 333;2011 si 1
Ex2.Media aritmetica a numerelor 11 si x este 22.Determinati x.
Ex3.Irina are la istorie notele 6;10;8.Ce medie are pana acum Irina la istorie?
Ex4.Corina a masurat temperatura aerului la ora 12 in 5 zile ale unei saptamani si a gasit valorile:13 grade C;17 grade C;15gradeC;20gradeC si 10gradeC.Care a fost madia temperaturilor din cele cinci zile?
Ex5.Calculati media aritmetica a numerelor:
a)7;8;36 b)20;81;103 c)12345;21;675 d)2x;4x;5x;9x e)12;14;16;18 f)80;43;66.va rog frumos urgent dau coroana

Answer 1

a)ma=(3+11):2=>ma=14:2=>ma=7
ma=(4+56):2=>ma=60:2=>ma=30
ma=(202+38):2=>ma=240:2=>ma=120
ma=(0+38):2=>ma=38:2=>ma=19
ma=(31+53):2=>ma=84:2=>ma=42
ma=(2011+2009):2=>ma=4020:2=>ma=2010
ma=447+333):2=>ma=780:2=>ma=390
ma=(2011+1):2=>ma=2012:2=>ma=106
2)ma=(11+x):2=22=>ma=(22-11):2=>ma=11:2=>ma=5,(1)
3)ma=(6+10+8):3=>ma=24:3=>ma=8
4)ma=(13+17+15+20+10):5=>ma=75:5=>ma=15
5)ma=(7+8+36):3=>ma=51:3=>ma=17
ma=(20+81+103):3=>ma=204:3=>ma=68
ma=(12345+21+675):3=>ma=13041:3=>ma=4347
ma=(2x+4x+5x+9x):4=>ma=20x:4=>ma=5x
ma=(12+14+16+18):4=>ma=60:4=>ma=15
ma=(80+43+66):3=>ma=189:3=>ma=63