题型:名词解释 己知函数f(x)=3sinxcosx+cos2 x-12,△ABC三个内角A,B,C的对边分别为a,b,c,且f(B)=1.(I)求角B的大小;(II)若a=3,b=1,求c的值. 查看答案
题型:名词解释 The brown trousers _______ 70 dollars. And that white pair of trousers _______ 80 dollars.A.is; isB.is; areC.are; are D.are; is 查看答案