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It depends on whether you mean 45, 4.5, 0.45, 0.045, or 0.0045

If you mean 45, the answer is 45/1

If you mean 4.5, the answer is 9/2

If you mean 0.45, the answer is 9/20

If you mean 0.045, the answer is 9/200

If you mean 0.0045, the answer is 9/2000

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11y ago

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