2024届重庆市高三第八次质量检测数学.考卷答案

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2024届重庆市高三第八次质量检测数学.考卷答案试卷答案

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分析由已知及正弦定理可得:sinC=$\frac{csinB}{b}$=$\frac{\sqrt{3}}{2}$,由c>b,可得C∈(30°,180°),即可求得C的值.

解答解:∵$b=5\sqrt{3}$,c=15,B=30°,
∴由正弦定理可得:sinC=$\frac{csinB}{b}$=$\frac{15×sin30°}{5\sqrt{3}}$=$\frac{\sqrt{3}}{2}$,
∵c>b,可得C∈(30°,180°),
∴C=60°或120°.
故答案为:60°或120°.

点评本题主要考查了正弦定理及特殊角的三角函数值的应用,考查了计算能力,属于基础题.