题目

分解因式（1）    (5分)     （2）   (5分)    答案： 解：（1）原式=（x+3y）2-2（x+3y）（4x-3y）+（4x-3y）2=[(x+3y)-(4x-3y)]2=(x+3y-4x+3y)2               =[-3(x-2y)]2=9(x-2y)2………………………………(5分)（2）原式=2[(2a-3)2-4(2a+3)2]=2[(2a-3)+2(2a+3)][(2a-3)-2(2a+3)]               =2(2a-3+4a+6)(2a-3-4a-6)               =2(6a+3)(-2a-9)=-6(2a+1)(2a+9)……………………词汇应用（共10分，每小题1分）根据句子意思，用括号中所给汉语提示或英语单词的适当形式填空。（每空一词）1.I can’t understand his __________(silent) on such a matter.2.They are looking forward to their grandpa’s ___________(nine) birthday party.3.The noise upstairs kept me ___________(wake)all the night.4.There will be a bridge _____________(connect)the school to the village in the near future.5.Please pay attention to your _______________(pronounce) when you read English.6.Millie is still not used to the _______(热量) in summer here.7.Our teacher often reminds us to pronounce words______________（正确地).8.Tom ____________(更喜欢)swimming to skating when he was young.9.The _____________(决定) you have made don’t seem so good. You need to be thoughtful.10.________________(粗心)will be a disaster not only to doctors but also to patients.