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【简答题】
M: H elen! it’s so great to see you! W: Frank! How long has it been since we last_1_ each other? M: _2_ months, by my _3_. Isn’t that _4_? Did you get my _5_ card? W:I Did. Did you get mine? M: Yes, the card was so _6_. And I loved your letter. W: Actually, I’d rather make phone calls than write a letter. M: I know just what you mean. But my old phone was _7_ and your number was_8_. W: I’ll have to get your mobile phone number, too. M: Do you have an e-mail_9_? W: Yes. Can you get e-mail in your phone? M: Yes. That’s great. Now we’ll have no _10_ not to keep in touch.
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【简答题】设n阶实方阵A有n个两两正交的特征向量ξ 1 ，ξ 2 ，…，ξ n .证明：A为对称矩阵.
【简答题】设n阶实方阵A有n个两两正交的特征向量ξ 1 ，ξ 2 ，…，ξ n .证明：A为对称矩阵.
【判断题】设 a>b> 0, n> 1 . 证明: . 证明:对函数 在[ b , a ]上应用拉格朗日中值定理,得 ,即 , . 显然有 , 故 , 或 . 证明过程是否正确?
A.
正确
B.
错误
【简答题】refund n./vt. 2. harassment n. 3. redundant a. 4. salvation n. 5. sanction v./n. 6. retrospect v./n. 7. rigorous a. 8. scandal n. 9. abolish v 10. primitive a. 11. ambiguous a. 12. acquain...
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