2025-08-30

$\text{LATEX}$の練習

40km/hと60km/hの平均
$\frac{2}{\frac{1}{40}+\frac{1}{60}}km/h$
$\frac{2\times (40\times 60)}{(\frac{1}{40}+\frac{1}{60})\times (40\times 60)}km/h$
$\frac{2\times 40\times 60}{\frac{1}{40}\times (40\times 60)+\frac{1}{60}\times (40\times 60)}km/h$
$\frac{2\times 2400}{\frac{40}{40}\times 60+40\times \frac{60}{60}}km/h$
$\frac{4800}{1\times 60+40\times 1}km/h$
$\frac{4800}{60+40}km/h$
$\frac{4800}{100}km/h$
$48km/h$

xkm/hとykm/hの平均
$\frac{2\times (x\times y)}{x+y}km/h$
$\frac{2xy}{x+y}km/h$