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b) 1/2pierw.5=2√5/20
c) 1/pierw.15=√15/15
d) 3/2pierw.3=6√3/12
b) 1/2√5 × 2√5/2√5 = 2√5/20 = √5/10
c) 1/√15 × √15/√15 = 1√15 / 15
d) 3/2√3 × 2√3/2√3 = 6√3/12= √3/6