你能帮帮他们吗
精彩回答
Many people believe that 3G mobile phones will be used in almost all everyday activities.
1年前
在△ABC中,角A,B,C所对的边分别为a,b,c,若a^2-b^2=2bc,sinC=3sinB,则A=______.
1年前
“How are you?”is a nice question. It’s a friendly way that people in the USA greet each other.
1年前
在△ABC中,已知tan(A+B)/2=sinC,给出4个判断 1.tanA*tanB=1; 2.1
1年前
1年前