INCLUDEPICTURE"课后达标检测LLL.TIF" INCLUDEPICTURE "../../../../新建文件夹/课后达标检测LLL.TIF" \* MERGEFORMAT INCLUDEPICTURE "../../../../新建文件夹/课后达标检测LLL.TIF" \* MERGEFORMAT INCLUDEPICTURE "../../../../课后达标检测LLL.TIF" \* MERGEFORMAT INCLUDEPICTURE"基础达标.TIF" INCLUDEPICTURE "../../../../新建文件夹/基础达标.TIF" \* MERGEFORMAT INCLUDEPICTURE "../../../../新建文件夹/基础达标.TIF" \* MERGEFORMAT INCLUDEPICTURE "../../../../基础达标.TIF" \* MERGEFORMAT 1．在△ABC中，角A，B，C的对边分别为a，b，c.若A＝60°，c＝2，b＝1，则a＝( ) A. B．7 C. D．3 解析：选C.已知A＝60°，c＝2，b＝1，由余弦定理得a2＝b2＋c2－bc＝12＋22－1×2＝3，解得a＝.故选C. 2．在△ABC中，a＝4，b＝1，cos C＝，则△ABC的面积为( ) A. B．2 C. D．2 解析：选C.因为cos C＝，且0
