语文版中职英语基础模块上册unit11friendship1内容摘要:
hem. 与 …. 相处得好, get along well with sb 想一想 A number of 与 the number of 的区别 People use the word “friend” freely. Friends may have known each other since childhood or they may have recently met. Freely Free adj. 自由的,空闲的,免费的 Freedom n. 自由 Each other 相互 ,彼此 我们应该彼此互相帮助。 In fact, people may have different kinds of friends, such as school friends, work friends, or sports friends. A person may choose different friends for different activities. Choose ……for 为 ……. 选择 ……. 我为你选择了一个有趣的电影。 If you play with someone on the play ground, the person is your playmate. If you often play chess with a friend, the person is your chess partner. 由。语文版中职英语基础模块上册unit11friendship1
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s a manager. He is dreaming to be a doctor. *************************************************************************** • Put the following sentences into Chinese. 1) My parents and I enjoy living
ular MY FAMILY • Who? • What ? • How old? • How? uncle student young tall/thin/handsome/cool Grammar :代词 一、人称代词 表示“我”、“你”、“他”、“她”、“它”、“我们” “你们”、“他们”的词,叫做人称代词。 人称 词有人称、数和格的变化,见下表: 人称代词 • 二、物主代词 表示
- 1 ) 34=3 n - 14, 得 a n = ( 3 n - 1 ) 2n - 2. 【点拨】 ( 1 ) 证明数列 { b n } 是等比数列 , 常用方法: ① 定义法; ② 等比中项法. (2 ) 证明数列不是等比数列 , 可举一个反例或用反证法. ( 2 0 1 3 陕西 ) 设 { }a n 是公比为 q的等比数列 . ( 1 ) 推导 { }a n 的前 n 项和公式; (
a+ d)=- 24, 所以 a= 2,代入 a(a- d)(a+ d)=- 24, 化简得 d2= 16,于是 d= 177。 4, 故三个数为- 2,2,6或 6,2,- 2. 法二 设首项为 a,公差为 d,这三个数分别为 a, a+ d, a+ 2d, 依题意, 3a+ 3d= 6且 a(a+ d)(a+ 2d)=- 24, 所以 a= 2- d,代入 a(a+ d)(a+ 2d)=-
a1+ 5 d = 10 ,5 a1+ 10 d = 5. 解得 a1=- 5 , d = 3. ∴ Sn=- 5 n +n ( n - 1 )2 3 =32n2-132n . ( 3 ) 设数列的前三项分别为 a2- d , a2, a2+ d , 依题意有: ( a2- d )+ a2+( a2+ d )= 12 ,( a2- d ) a2 ( a2+ d )= 48 ,