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2.2,25-0,75=1,5l
3.5y+7=42 / -7
5y=35 / /5
y=7
4.3*4*5=60
5.0,009*1000=9
6.0,375
7.a)1/2
b)2/1=2
8.9+8=17
8,5/17=1/2
9*1/2=4,5
8*1/2=4
9.32/4=8
1/2*16*6=48dm2
10.0,25*1/10=0,025
0,25+0,025=0,275mln os.