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2015-05-08T20:08:02+08:00

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I don't know why your'e asking for a sum. Anyway I will assume that the 10-3 is supposed to be 10^{-3

When the power of 10 is negative we move it to the left at this case 3 times.

We move the decimal point 3 to the left and we get:
0.00495
0