Map algebra1

i am doing a bandmath operation. The expression i am using is

I am attaching the image from pixel info.

B4, B5, B6 have a value of 1 why the output shows -0.00000 and not -0.0005 ?

Actually, the result would be -0.0000005 and not -0.0005
And we show only the first 5 digits for a band of data type Float32. Which means that the last five of the result is not displayed.
If the data type would be double (float64) 10 decimal digits would be shown.

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