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Be sure there is a problem in the first place before working
1年前
设0≤x≤2π,且√(1-2sin xcosx=sin x-cos x,则 A.0≤x≤π Bπ/4≤x≤7π/4 Cπ
1年前
已知:如图,AF平分∠BAC,BC⊥AF,垂足为E,点D与点A关于点E对称,PB分别与线段CF,AF相交于P,M.
1年前
Dick lived in England. One day in January he said to his wif
1年前
英语翻译【一】A:我想和玛丽通话.B:对不起,玛丽不在.A:我是汤姆.我是她的同学.B:我可以为你捎个口信吗?A:请让她
1年前