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b]4,9×2,1=4,9(2+0,1)=4,9×2+4,9×0,1=9,8+0,49=10,29
zad.2a]133:7=(140-7):7=140:7-7:7=20-1=19
b]132:12=(120+12):12=120:12+12:12=10+1=11
c]27,5:2,5=(25+2,5):2,5=25:2,5+2,5:2,5=10+1=11
d]22,5:2,5=(25-2,5):2,5=25:2,5-2,5:2,5=10-1=9
zad.3a]86×72+86×28=86(72+28)=86×100=8600
b]36×57+(9-35)×57=57(36-26)=57×10=570
c](-3)×29,5+2×29,5=29,5(-3+2)=29,5×-1=-29,5