- 2023-09-27【230927-7】若▲ABC的三个内角满足SinA:SinB:SinC=5:11:13,则▲ABC为(锐角/直角/钝角)三角形?
- 2023-09-19【230919-2】▲ABC中,a=2倍根号2,CosA=3/4,SinB=2SinC,求:S△ABC=?
- 2023-08-25【230827-1】▲ABC中,b=1,S△ABC=根号三/2,且2CosA^2+根号3*Sin2A=2.则A=?,(b+c)/(SinB+SinC)=?
- 2023-08-25【230827-2】▲ABC中,a=4,b=二倍根号六,Sin2A=SinB。求:c=?
- 2023-08-23【230823-1】▲ABC中,a=根号3,SinB=1/2,C=30°,则b=?
- 2023-08-03【230803-2】三角形ABC中,已知(b+c):(a+c):(b+a)=4:5:6,则SinA:SinB:SinC=?
- 2023-08-01【230801-4】在三角形ABC中,角A,B,C的对边分别是a,b,c,SinA,SinB,SinC成等比数列,且c=2a,则CosB=?
- 2023-07-31【230731-2】三角形ABC的内角A,B,C的对边分别为a,b,c,已知SinB+SinA(SinC-CosC)=0,a=2,c=根号2,则C=?