Odpowiedź:
[tex]x\cdot5^9=0,2^{11}\cdot25^{11}\\\\x\cdot5^9=(0,2\cdot25)^{11}\\\\x\cdot5^9=5^{11}\\\\x=5^{11}:5^9\\\\x=5^{11-9}\\\\x=5^2\\\\x=5\cdot5\\\\\boxed{\boxed{x=25}} \ (A)[/tex]
