1)
10+10
10+10+ =30 20+(400:40)=20+10=30
10+10
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2)
2
1+ =2,2 1+((2*3):(2+3))=1+6:5=1+1,2=2,2
3
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1
2+ =2,75 2+((1*3):(1+3))=2+3:4=2+0,75=2,75
3
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1
3+ =3,67 3+((1*2):(1+2))=3+2:3=3+0,666
2
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1
2 =0,55 (1*2*3):(1*2+2*3+3*1)=6:11=0,545
3