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在△ABC中,AD为中线,BE为角平分线,则在以下等式中:①∠BAD=∠CAD;②∠ABE=∠CBE;③BD=DC;④AE=EC.正确的是( )
1年前
Weekends are important for us. We can relax ourselves.
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Many people believe that 3G mobile phones will be used in almost all everyday activities.
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I always know you are the best one. Trust me and trust _____.
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设A为m*n矩阵,B为n*s矩阵,证明:AB=0的充要条件是B的每个列向量均为齐次线性方程组AX=0的解.
1年前