配套习题- 余弦定理的应用 -【青果学院】

1/4单选题

难度：

1.在三角形ABC中，

分别为内角A，B，C所对的边，若b=3，c=

，A=30°，则角C等于（）

A	30°
B	120°
C	60°
D	150°

正确答案：Qg==

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

2/4单选题

难度：

2.已知△ABC中，AB=2，AC=3，BC=4，则角A，B，C中最大角的余弦值为（　　）

A
B
C
D

正确答案：QQ==

6Kej5p6Q77ya5qC55o2u6aKY5oSP77yMPGltZyB3aWR0aD04NyBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC80QS8wRC9yQkFDRkZSQTBlU0Nia2VKQUFBQjlnUktIY2s4NDIucG5nIj7vvIzmoLnmja7lpKfovrnlr7nlpKfop5LvvIzlsI/ovrnlr7nlsI/op5LvvIzmnIDlpKfop5LkuLriiKBB77yM5bey55+lQUI9Mu+8jEFDPTPvvIxCQz0077yM5omA5LulPGltZyB3aWR0aD0yMTAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMDQvOUMvckJBQ0psUkEwZVNqbDg1T0FBQUVBMmp6dW9VMjU4LnBuZyI+44CC5pWF6YCJQQ==

3/4单选题

难度：

3.在三角形ABC中，已知三边

，满足

，则c=（）

A	15°
B	30°
C	45°
D	60°

正确答案：RA==

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

4/4单选题

难度：

4.在△ABC中，B=60°，

，则△ABC是（）

A	锐角三角形
B	钝角三角形
C	等腰三角形
D	等边三角形

正确答案：RA==

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