设<img align="middle" alt="" src="/api/uploads/60000062155/in-rich-contentcreated_at=1648696624">，<img align="middle" alt="" src="/api/uploads/60000062156/in-rich-contentcreated_at=1648696624">，则<img align="middle" alt="" src="/api/uploads/60000062157/in-rich-contentcreated_at=1648696624">（　）．(单选题)<br>.2<br>.0<br>.-2<br>.4

设<img align="middle" alt="" src="/api/uploads/60000062155/in-rich-contentcreated_at=1648696624">，<img align="middle" alt="" src="/api/uploads/60000062156/in-rich-contentcreated_at=1648696624">，则<img align="middle" alt="" src="/api/uploads/60000062157/in-rich-contentcreated_at=1648696624">（　）．(单选题)
.2
.0
.-2
.4

出自：2024年国家开放大学答案

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