A. e-2x+ B.-2e-2x C. -2e-2x+ D.4e-2x+A. e-2x+ B.-2e-2x C. -2e-2x+ D.4e-2x+

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问题

选项 A. e-2x+
B.-2e-2x
C. -2e-2x+
D.4e-2x+

答案D

解析
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