final formula

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1.

The final formula for the moment of inertia about the origin is the double integral of a region of r squared density dA .

关于原点的转动惯量，就是在区域上，求 r^2*δ *dA 的二重积分。

guān yú yuán diǎn de zhuǎn dòng guàn liàng , jiù shì zài qū yù shàng , qiú r^ èr xīng hào δ xīng hào dA de èr chóng jī fēn 。

2.

It is usually best to avoid substitution of numerical values until the final formula has been obtained .

在得到最终公式以前最好不要代入数值。

zài dé dào zuì zhōng gōng shì yǐ qián zuì hǎo bú yào dài rù shù zhí 。