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☆基础篇诊断检测一、选择题1.在△ABC中,B=60°,b=76,a=14,则角A的值是()(A)75°.(B)45°.(C)135°或45°(D)30°2.三角形的三边之比为3∶5∶7,则其最大角为()(A)π2.(B)2π3.(C)3π4.(D)5π6.3.在△ABC中,∠A、∠B、∠C的对边依次为a,b,c,若cosAcosB=ba,则△ABC是()(A)等腰三
☆ Basics Diagnostic tests 1. Multiple choice questions 1. In △ABC, B=60°, b=76, and a=14, then the value of angle A is () (A) 75°. (B) 45°. C) 135° or 45° (D) 30° 2. The ratio of the three sides of the triangle is 3:5:7, then the maximum angle is ()(A)π2.(B)2π3.(C)3π4.( D) 5π6.3. In △ABC, the opposite sides of ∠A, ∠B, and ∠C are sequentially a, b, and c. If cosAcosB=ba, then △ABC is ()(A) isosceles.