問題詳情
六、假設 z = x 2 + 2 y 2 , x = r cosθ , y = r sin θ ，求偏微分 
？（20 分）
？（20 分）
參考答案
答案：D
難度：適中0.651079
統計：A(18),B(55),C(64),D(362),E(0)
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