题目内容

Before long, he______all about the matter.

A. will have forgotten
B. forget
C. have forgotten
D. forgot

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I _____enough to put a down-payment on a house by the time I am 30.

A. will earn
B. will have earned
C. will be earning
D. earned

二次型的化简,方法有拉格朗日配方法。

A. 对
B. 错

二次型的话简主要是把交叉项消除。

A. 对
B. 错

上面的对角矩阵可以称为。