（單選題）
（單選題）下列說法正確的是
（單選題）有等式AB=0?，則下列結(jié)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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齊次線性方程組的通解的求法
考點為線性方程組基礎解系中解向量的個數(shù)=未知數(shù)的個數(shù)-秩=3-2=1
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