（單選題）L%7D4%24FXO%60)FE.png)
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（單選題）下列說法正確的是
（單選題）有等式AB=0?，則下列結論中正確的是（）
設A為m×n矩陣，齊次線性方程組Ax=0有非零解的充分必要條件是
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（單選題）
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實二次型的定義
根據(jù)二次型寫出對應的矩陣，再進行初等行變換，可以得到秩為1
多做幾道
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