the performers marched across the park,_(wave)to the visitors

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• the performers marched across the park,_(wave)to the visitors
• They marched across the park,____(sing) and ____(dance) happily
• They marched across the park,____(sing) and ____(dance) happily
• the performers marched across the park,_(wave)to the visitors
• 设A是n阶实对称幂等矩阵,即A²=A.（1）证明：存在正交矩阵Q,使得(Q-1)AQ=diag（1,1,……,1,0,……,0）（2）若A的秩为r,计算det（A-2I）.
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