phys: polish math and add more examples to topic 1
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@ -23,7 +23,7 @@ Every other SI unit is derived from fundamental units. Memorise these!
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Every SI unit can be expanded with metric prefixes.
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!!! example
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milli + metre = millimetre ($10^{-3}) m
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milli + metre = millimetre ($10^{-3}$) m
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| Prefix | Abbreviation | Value | Inverse ($10^{-n}$) abbreviation | Inverse prefix |
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| --- | --- | --- | --- | --- |
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@ -55,6 +55,8 @@ Every SI unit can be expanded with metric prefixes.
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!!! example
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$$1.25 + 1.20 = 2.45$$
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$$1.24 + 1.2 = 2.4$$
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$$1.2 × 2 = 2$$
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$$1.2 × 2.0 = 2.4$$
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!!! warning
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When rounding an answer with significant figures, if the **least significant figure** is $5$, round up only if the **second-least** significant figure is odd.
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