恆等式

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((héng )(děng )(shì )(héng )(děng )(shì ))

()(zuò )(héng )(děng )(shì )”。

(shù )(xué )(fāng )(chéng )(zhōng )(děng )(hào )(liǎng )(biān )(suǒ )(hán )(de )(wèi )(zhī )(liàng )()(lùn )(yòng )(rèn )()(shù )(dài )()(liǎng )(biān )(shù )(zhí )(yǒng )(yuǎn )(xiàng )(děng )(zhè )(yàng )(de )(fāng )(chéng )(jiào )(héng )(děng )(shì )

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●恆等式(简体版)

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