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b)(3/4)^2=9/16
c)5^4*5^-2:5^3=5^2:5^3=5^-1=1/5
d)8^1/3+9^1/2=3√ 8(pierwiastek 3 stopnia)+√ 9=2+3=5
(3/4)^2 = 9/16
5^4 * 5^-2 / 5^3 = 5^2 : 5^3 = 5^-1 = 1/5