bi li de ji ben xing zhi

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bi li de ji ben xing zhi

bi li de ji ben xing zhi
bi li de ji ben xing zhi

bi li de ji ben xing zhi
比例的基本性质:组成比例的四个数,叫做比例的项.两端的两项叫做比例的外项,中间的两项叫做比例的内项.在比例里,两个外项的积等于两个内项的积.

什么意思

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tiuiu

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