问题
填空题
已知f(x)=
|
答案
不妨设m＞0，n＜0，
f（m）+f（n）=
-1-m2
=1-n2
，(n-m)(n+m)
+1-m2 1-n2
∵n-m＜0，f（m）+f（n）＞0．
∴n+m＜0．
故答案为：n+m＜0．
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已知f(x)=
|
不妨设m＞0，n＜0，
f（m）+f（n）=
-1-m2
=1-n2
，(n-m)(n+m)
+1-m2 1-n2
∵n-m＜0，f（m）+f（n）＞0．
∴n+m＜0．
故答案为：n+m＜0．
| 完形填空。 | ||||
| In the summer vacation of 1997, I was fixed with a job. I worked as a(n) 1 at Mr. Breen's fruit shop.The fruit shop did 2 business. Most of the trade came from the housewives who lived in the neighborhood, 3 he also had regular customers who arrived outside the shop in cars. Mr. Breen 4 them all by name and they sometimes even had their order already made up, always 5 me to carry it out to their car. They were clearly long-standing customers, and I 6 they must have stayed faithful to him 7 he had promised to sell good quality 8 . He had a way with them -I had to 9 that. He called every woman"madam" for a start, 10 those who clearly were not, but when he 11 it, it did not sound like flattery (奉承). It just sounded 12 in an old-fashioned way. He was a great chatter 13 . If he did not know them, he would greet them with a few 14 about the weather, 15 he did, he would ask about their families or make 16 , always cutting his cloth 17 his customers. Whatever their bills came to, he 18 gave them back the few odd pence (零钱), and I am sure they thought he was very generous (慷慨). But I thought he was the opposite. He never 19 anything away. He was always looking for 20 for nothing. | ||||
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