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Li Ming is so careful that he always looks over his exercises to ______ there are no mistakes.
10个月前
Have you seen Henry lately? My boss wants to know ______.
1年前
Catherine is eating dinner. (改为否定句)
1年前
在△ABC中,角A,B,C所对的边分别是a,b,c.己知csinA= 3 acosC. (Ⅰ)求C; (Ⅱ)若c= 7 ,且sinC+sin(B-A)=3sin2A,求△ABC的面积.
1年前
1年前