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Sm = 1,2 * 10^-5 m2
Sb = 510 m2 = 5,1 *10^2 m2
Sb/Sm = 5,1 * 10^2 : 1,2 *10^-5 = 4,25 * 107
b)
2,5 * 10^-7 : 25 = 2,5 * 10^-7 : 2,5 *10 = 10^-8 m