ma=p1*a1+p2*a2+...+pn*an/p1+p2+...pn
a) p1=2 p2=3
a1=4 a2=9
ma=2*4+3*9/2+3
ma=8+27/5
ma=35/5
ma=7
b)
ma=4*2+8*5/4+8
ma=8+40/12
ma=48/12
ma=4
c)
ma=(14*4/7+10*8/5)/14+10
ma=38+16/24
ma=54/24
ma=9/4
d)
ma=(4*1/2+6*4/3)/4+6
ma=2+8/4+6
ma=10/10
ma=1
e)
0,(6)=6/9=2/3
2,(6)=8/3
ma=(3*2/3+6*8/3)/3+6
ma=2+16/9
ma=18/9
ma=2
f)
ma=4*3,4+5*2,4/4+5
ma=13,6+12/9
ma=25,6/9