问题 解答题
已知:x+
1
x
=3
,求:(1)x2+
1
x2
(2)(x-
1
x
)2
答案

(1)∵x+

1
x
=3,

∴x2+2+

1
x2
=9,

∴x2+

1
x2
=7;

(2)∵x2+

1
x2
=7,

∴(x-

1
x
2=x2-2+
1
x2
=7-2=5.

故答案为:(1)7;(2)5.

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书面表达:

       假如你是“东北虎保护协会”会员,请你以东北虎的名义写一封给人类的公开信,呼吁人类保护东北虎。信的内容包括以下要点;

       1. 你们大量砍伐森林,我们的食物减少,居住地缩小; 

       2. 你们大量捕杀我们,用虎骨制药、虎皮制衣; 

       3. 希望你们扩大老虎保护区,保护我们;

       4. 让老虎和人类和平共处。

       注意:

       1. 短文必须包含以上内容;

       2. 短文以第一人称写; 

       3. 词数60左右,开头已给出,不计入总词数。

Dear Man, 

       I'm a tiger in the northeast of China. I'd like to have a talk with you. We lived in the forest happily for

thousands of years, and then you came! And now we are in danger. __________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________. 

                                                                                                                                   Yours

                                                                                                                                  A Worried Tiger

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