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(¾ × 5,4 - 2,3 : 4) × 2=(0,75*5,4-0,575)*2=(4,05-0,575)*2=3,475=6,95
5% z 6,95=0,05*6,95=0,3475
Odp.:C
139/20 * 5%=139/20 * 5/100=139/400=0,3475
C. 0,3475