21n2的精选

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等于A.-21n2   B.21n2   C.-ln2     D.ln2

等于A.-21n2   B.21n2   C.-ln2     D.ln2

2021-06-12
问题详情：等于A.-21n2   B.21n2   C.-ln2     D.ln2【回答】D知识点：导数及其应用题型：选择题...