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2014-04-28T16:06:18+03:00
A) 
a=1,75*4+3,5=7+3,5=10,5
b=15,9:0,3-44,5=53-44,5=8,5
Ma=a+b/2=19:2=9,5
b)
a=(15/9+129/9)*100/25
a=144/9*100/25=104/3=34,(6)
b=21-2/90-1/90)*20
b=18/90*20=4
Ma=34,(6)+4/2=38,(6)/2=347/18=174/9=19,(3)