1、,数学 A（理）,第四章 三角函数、解三角形,45分钟阶段测试(六),2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10,1,答案 C,3,4,5,6,7,8,9,10,1,2,又A为三角形的内角，A30.,A,2,4,5,6,7,8,9,10,1,3,3.设ABC的内角A、B、C所对的边分别为a、b、c，若三边的长为连续的三个正整数，且ABC,3b20acos A，则sin Asin Bsin C为( ) A.432 B.567 C.543 D.654,2,4,5,6,7,8,9,10,1,3,2,3,5,6,7,8,9,
2、10,1,4,2,3,5,6,7,8,9,10,1,4,答案 C,2,3,4,6,7,8,9,10,1,5,2,3,4,6,7,8,9,10,1,5,2,3,4,5,7,8,9,10,1,6,2,3,4,5,6,8,9,10,1,7,2,3,4,5,6,8,9,10,1,7,2,3,4,5,6,9,10,1,7,8,2,3,4,5,6,7,8,10,1,9,2,3,4,5,6,7,8,10,1,9,2,3,4,5,6,7,8,10,1,9,2,3,4,5,6,7,8,10,1,9,2,3,4,5,6,7,8,9,1,10,2,3,4,5,6,7,8,9,1,10,2,3,4,5,6,7,8,9,1,10,2,3,4,5,6,7,8,9,1,10,
