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Subtract 2.5xx10^4 and 3.9xx10^5 with du...

Subtract `2.5xx10^4` and `3.9xx10^5` with due regard to significant figures.

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Let `xx=2.5xx10^4=25000`
`y=3.9xx10^5=390000`
`y=x=39000-25000=3.65xx10^5=3.6xx10^5` rounded up to one place of decimal.
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