phys: polish math and add more examples to topic 1

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eggy 2020-09-20 15:20:32 -04:00
parent 9451c38f45
commit 3ca9eca95c

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@ -23,7 +23,7 @@ Every other SI unit is derived from fundamental units. Memorise these!
Every SI unit can be expanded with metric prefixes.
!!! example
milli + metre = millimetre ($10^{-3}) m
milli + metre = millimetre ($10^{-3}$) m
| Prefix | Abbreviation | Value | Inverse ($10^{-n}$) abbreviation | Inverse prefix |
| --- | --- | --- | --- | --- |
@ -55,6 +55,8 @@ Every SI unit can be expanded with metric prefixes.
!!! example
$$1.25 + 1.20 = 2.45$$
$$1.24 + 1.2 = 2.4$$
$$1.2 × 2 = 2$$
$$1.2 × 2.0 = 2.4$$
!!! warning
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.