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$$\frac{\Delta V}{V} = \frac{\Delta a}{a}+\frac{\Delta b}{b}+\frac{\Delta c}{c}$$

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$B:#!"(B$a,b,c$ $B$N4QB,CM$r$=$l$>$l(B $\bar{a},\bar{b},\bar{c}$ $B$H$9$k$H!"(B $B$3$l$i$O$=$l$>$l??$NCM(B $a,b,c$ $B$KBP$7$F@dBP8m:9(B $\Delta a$, $\Delta b$, $\Delta c$, $B$r4^$`$N$G!"(B

$$\bar{a}=a+\Delta a,\hspace{0.5zw} \bar{b}=b+\Delta b,\hspace{0.5zw} \bar{c}=c+\Delta c$$

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$$V=abc,\hspace{1zw}\bar{V}=\bar{a}\bar{b}\bar{c}$$

$B$H$J$k$N$G!"$3$NBN@Q$N@dBP8m:9(B $\Delta V = \bar{V}-V$ $B$O(B

$$\begin{eqnarray*} \Delta V & = & \bar{V}-V = \bar{a}\bar{b}\bar{c} - abc = (a+... ...\Delta a\Delta c+ c\Delta a\Delta b + \Delta a\Delta b\Delta c) \end{eqnarray*}$$

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$$\Delta V \approx ab\Delta c + ac\Delta b + bc\Delta a$$

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$$\begin{eqnarray*} \frac{\Delta V}{V} & \approx & \frac{ab\Delta c + ac\Delta ... ...= & \frac{\Delta c}{c} + \frac{\Delta b}{b} + \frac{\Delta a}{a} \end{eqnarray*}$$

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