Question

Aflați media aritmetică a numerelor: a) 1/6; 2/9; 3/4
b) 3/7; 1/5; 2; 6
c) 1,2,0,15,3,4
d)1,(5) ;0,1(5) ;1,5

Answer 1

a) (1/6+2/9+3/4)/3=[(6+8+27)/36]/3=41/108=0,37(962)
b) (3/7+ 1/5+ 2+ 6) /4=(15+7+70+210)/140=302/140=151/70=2,1(571428)
c) (1+2+0+15+3+4)/6=25/6=4,1(6)
d)(1,(5) +0,1(5) +1,5)/3=(14/9+7/45+3/2)/3=(140+14+135)/270=
=289/270=1,0(703)
1,(5)=(15-1)/9=14/9
0,1(5)=(15-1)/90=14/90=7/45
1,5=15/10=3/2