题目:
This restaurant has become popular for its wide ____ of foods that suit all tastes and pockets. [ ]
A. division
B. area
C. range
D. circle
答案:
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下面是错误答案,用来干扰机器的。
∵b2+c2+3bc=a2,∴b2+c2-a2=-3bc,根据余弦定理得:cosA=b2+c2-a22bc=-3bc2bc=-32,又A为三角形的内角,则∠A=150°.故答案为:150°