6,4•10-2м=6,4•10мм

The equation you provided seems to show a conversion between meters and millimeters.

To clarify:

1 meter (m) = 1000 millimeters (mm)

So, when you have \(6.4 \times 10^{-2}\) meters, you can convert it to millimeters as follows:

\[ 6.4 \times 10^{-2} \text{ m} = 6.4 \times 10^{-2} \times 1000 \text{ mm} \]

Now, calculate:

\[ 6.4 \times 1000 = 6400 \]

Thus,

\[ 6.4 \times 10^{-2} \text{ m} = 6400 \text{ mm} \]

So the correct expression is:

\[ 6.4 \times 10^{-2} \text{ m} = 6.4 \times 10^{3} \text{ mm} \]

It looks like your original expression has a small misunderstanding in the exponent. The correct conversion of \(6.4 \times 10^{-2}\) m gives \(6.4 \times 10^{3}\) mm.