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b) (-2x^2)^3 = -8x^6
c) (-x^2y^3)^3 = - x^6y^9
d) (-4x^4/3y)^3= - 64x^{12}/27y^3
a) 45^2:5^2 = (45:5)^2=9^2=81
b) (1 i 3/5)^10*(5/8)^10 = (8/5*5/8)^10=1
c)(0,9)^5:9^5 = (0,9:9)^5=0,1^5=0,00001