a) √0,25 × 64 = √(1/4 × 64) = √16 = 4
б) √56 × √14 = √(56 × 14) = √(4 × 14 × 14) = 2 × 14 = 28
в) √8 / √2 = √(8 / 2) = √4 = 2
г) √3⁴ × 2⁶ = √(3⁴ × 2⁶) = 3² × 2³ = 9 × 8 = 72