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x - okienko
25⁴ = (5x)²
(5²)⁴=5² x²
5⁸=5² * (x)²
5⁸=5²*5⁶
x²=5⁶
(5³)²=5⁶
x=5³
x=125
2.
630mm=63cm=0,63m=0,00063km=6,3*10^{-4} km
Odp. B