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b) ³√2500 = 50 ³√2 Fałsz, bo:
50³√2=³√(50*50*50*2)=³√250000
c) √6400 * ³√0,008 + ³√-1 = 17 Fałsz, bo: 80*0,2-1=16-1=5
d) √25 - ³√27 : √0,09 = -5 Prawda, bo: 5-3:0,3=5-10=-5