Every function whose derivative is linear is a quadratic function. 任意一個(gè)導數為線(xiàn)性函數的函數都是二次函數。
Advertisement competition is studied under the monopolizing of double oligarchies by a linear model. 摘要利用線(xiàn)性函數模型對雙寡頭壟斷市場(chǎng)下企業(yè)廣告競爭進(jìn)行研究。
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