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a) (43+17):2 = 60:2 = 30
b) (24+26):2 = 50:2 = 25
c) (48+32):2 = 80:2 = 40
d) (57+85):2 = 142:2 = 71
Zadanie 2.
a) (44+46+48):3 = 138:3 = 46
b) (81+65+43):3 = 289:3 = 63
c) (12+18+24):3 = 54:3 = 18
d) (202+198+239):3 = 639:3 = 213
Zad2. Oblicz średnią arytmetyczną trzech liczb: a) 44, +46 +48 /3 = 139 ; 3 = 46. (3) B) 81, +65 + 43 /3 = 189 ;3 63 c) 12 +18 + 24 /3 = 54;3 =18 d) 202 + 198 + 239 /3 = 639 ;3 = 213