三階行列式7%7BAB.png)
未知數(shù)x的三次方的系數(shù)為（）
（單選題）下列說(shuō)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(shè)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
???????
（單選題）
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二階行列式與三階行列式
GB_BFA%5BPX%60POXT4%5B7.png)
???????，所以未知數(shù)x的三次方的系數(shù)為-2
多做幾道
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