问题
填空题
已知y=（k+2）xk2+k-4是二次函数，且当x＞0时，y随x增大而增大，则k=______．
答案
由题意得：k2+k-4=2；k+2＞0；
解得：k=-3或k=2；k＞-2；
∴k=2
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已知y=（k+2）xk2+k-4是二次函数，且当x＞0时，y随x增大而增大，则k=______．
由题意得：k2+k-4=2；k+2＞0；
解得：k=-3或k=2；k＞-2；
∴k=2
| 完形填空。 | ||||
| Big Ben? It's not the name of a person. It's a famous 1 in London. It is part of a very big clock at the top of a tower (塔). The minute hands of the clock 2 more than four metres long. The clock has four 3 . You can see what 4 it is from any side (面). The name of the bell comes 5 Sir Benjamin Hall. The tower is about 150 years old. The bell makes a loud 6 every hour. On New Year's Eve, millions of people listen to it on TV!
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