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[(√0,81 + √1,21 +√1,69) : (√1600 :√400)]*70% = [(0,9 + 1,1 + 1,3) : (40 : 20)]*0,7 =
= (3,3 : 2)*0,7 = 1,65*0,7 = 1,155
zad 15
{(√√81*√16) : [2*(√5¹/₁₆ + √3¹/₁₆)]} * 100% = {(√9*4) : [2*(√⁸¹/₁₆ +√⁴⁹/₁₆)]} * 100% =
= {√36 : [2*(⁹/₄ + ⁷/₄)]} * 100% = [6 : (2 * ¹⁶/₄)] * 100% = (6 : ³²/₄) * 100% =
= (6 : 8) * 100% = 0,75 * 100% = 75%