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b) 4³:4+(osiem czwartych)²=64:4+4=16+4=20
c) 7³:7²-2³×(jedna druga)³ =343:49-8×1/8(jedna ósma)=7-1=6
4³:4+(8/4)²=4²( ponieważ mamy te same podstawy to odejmujemy potegi)+64/16=16+4=20
7³:7²-2³×(1/2)³=( ponieważ mamy te same podstawy to odejmujemy potegi) -8*1/8=7-8/8=7-1=6