设<img align="middle" alt="" src="/api/uploads/1530319/in-rich-contentcreated_at=1647290146">，<img align="middle" alt="" src="/api/uploads/1530320/in-rich-contentcreated_at=1647290146">，则<img align="middle" alt="" src="/api/uploads/1530321/in-rich-contentcreated_at=1647290146">（　）．(单选题)<br>.4.,.<br>2.,.<br>0.,.<br>-2

设<img align="middle" alt="" src="/api/uploads/1530319/in-rich-contentcreated_at=1647290146">，<img align="middle" alt="" src="/api/uploads/1530320/in-rich-contentcreated_at=1647290146">，则<img align="middle" alt="" src="/api/uploads/1530321/in-rich-contentcreated_at=1647290146">（　）．(单选题)
.4.,.
2.,.
0.,.
-2

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