问题
解答题
分解因式：（1）a3b-9ab3（2）a2b-4ab2+4b3．
答案
（1）原式=ab（a2-b2）…（5分）
=ab（a+b）（a-b）；…（10分）
（2）原式=b（a2-4ab+4b2）…（5分）
=b（a-2b）2．
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分解因式：（1）a3b-9ab3（2）a2b-4ab2+4b3．
（1）原式=ab（a2-b2）…（5分）
=ab（a+b）（a-b）；…（10分）
（2）原式=b（a2-4ab+4b2）…（5分）
=b（a-2b）2．
| 完形填空。 | ||||
| Nowadays, computers are becoming more and more 1 in many cities and towns. A lot of small shops and restaurants along busy streets change into 2 game houses. These places are always crowded with 3 , especially (尤其) young boys. In the computer game houses, people 4 a lot of money playing computer games. It's 5 for one to win against a computer, but one can try it again and again. People have a kind of gambling psychology (赌博心理) when they play computer games. The more they 6 , the more they want to win, and at last they even can't live without it. For school boys, they have no 7 in their lessons. When class is over, they rush to the nearby computer game houses. Some of them can get enough 8 from their parents. But some of them are not 9 to get money. They begin to steal (偷) 10 students' money and become thieves (贼). | ||||
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