Question

Please answer the question​

Answer 1

Answer:

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Answer 2

2. $\frac{1}{2.5} \\ \frac{1 }{ \frac{25}{10} } \\ \frac{1 \times 10}{25} \\ \frac{10}{25} \\ 0.4mm \\ i.e. \\ 0.04cm$
3. 0.0005m