正弦定理和余弦定理...会一两题的也进1.在△ABC中,若C=3B,求c/b的取值范围.2.已知△ABC中,a=x,b=2,∠B=45°,若三角形有两解,则x的取值范围是( )A.x>2 B.x<2C.2<x<2√(2) D.2<x<2√(3)3.在△ABC中,

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