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2]=4/5*1/2+2/9*9/10=4/10+2/10=6/10=0,6
3]=1/3*4/5*1/4=1/3*1/5=1/15
4]=1/2: 5/4=1/2*4/5=2/5
2. 0,4+0,2=0,6
3. 4/15:4=1/15
4. 0,5/1,25=0,4