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龙溪小学-梁柏添-Unit5 What day is it today
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Have you ever entered a competition?
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Leading in 3
Who is he??
He is very tall and strong.
He has small eyes and short dark hair.
He is a famous
Chinese basketball star.
Many people like him.
Who is he??-
The first
看动画,回答下列问题:
1、How many people are talking?
2、What have they made?
3、Who is going to the airport?原文:
Tony: Mmm ... That smells delicious! What are you making?
Betty: Hi, guys! I've made a pizza. Have some!
Tony: OK. Yes, it's great.
Betty: What's the matter, Daming?
Daming: It tastes too strong. I'm afraid I don't like cheese. It doesn't smell fresh. No, thanks.
Lingling: Well, I've made some chocolate cookies. Have a try! They taste really sweet.
Daming: That's much better.
Betty: You're wearing a lovely sweater, Lingling.
Lingling: Yes, it feels very soft and comfortable.
Tony: You both look very smart. And so much food! Are we having a party?
Lingling: We're going to the airport to meet my friend Sally from London.
Daming: What's she like?
Lingling: I haven't met her, but she sounds really nice.
Betty: And she looks very pretty in her photo.
Tony: Let's have a look. Hm, yes, I see what you mean!
Lingling: And then we're coming back here to have something to eat.
Tony: You must introduce me to her.
Betty: Sure we will. We'll be back soon.
Lingling: See you later.-
学习内容
一.重点知识
1.一元一次方程ax+b=0(a≠0)与一次函数y=ax+b(a≠0)的关系
(1)一元一次方程ax+b=0(a≠0)是一次函数y=ax+b(a≠0)的函数值为0时的特殊情形。
(2)直线y=ax+b与x轴交点的横坐标是一元一次方程a+b=0的解
2.一元一次不等式与一次函数的关系:
(1)一元一次不等式ax+b>0或ax+b<0(a≠0)是一次函数y=ax+b (a≠0)的函数值不等于0的情形。
(2)直线y=ax+b上使函数值y>0(x轴上方的图像)的x的取值范围是ax+b>0的解集;使函数值y<0(x轴下方的图像)的x的取值范围是ax+b<0的解集。
3.二元一次方程与一次函数的联系
(1)任意一个二元一次方程都可化成y=kx+b的形式,即使每个二元一次方程都对应一个一次函数,也对应一条直线。
(2)直线y=kx+b的每一点的坐标均为这个二元一次方程的解。
4.二元一次方程组与一次函数的关系
(1)二元一次方程组中的每个方程可看作函数解析式。
(2)求二元一次方程组的解可以看作求两个一次函数的交点坐标。
二.方法技巧
1.利用一次函数求一元一次方程的解题步骤。
(1)将一元一次方程化成ax+b=0的形式
(2)画出y=ax+b的图像,确定其与x轴交点的横坐标。
2.利用一次函数式求一元一次不等式的解集的技巧
根据不等式的特点,灵活采用求解方程: (1)利用一个一次函数;(2)利用两个一次函数。
3.利用一次函数解二元一次方程组的步骤
(1)将方程组中的每个方程转化成一次函数y=kx+b的形式。
(2)在同一直角坐标系中画出两函数的图像。
(3)利用图像的直观性确定交点坐标。
4.求两个一次函数的交点坐标的方法
解由两个一次函数的解析式组成的二元一次方程组,就能准确地求出交点坐标。
5.两个一次函数图像交点的作用
借助图像的直观性,利用交点坐标,可以解决有关比较,决策等生活实际问题。-
问题情境一 1
做一做:
1、指出函数y=3x-6的自变量与因变量,并作出其图象,用图象法求出当x取何值时,
(1)3x-6>0 (2)3x-6<0
2、用直接解不等式的方法求上题中的有两个不等式的解集,并比较两种方法的结果相同吗?
3、作出函数y=2x-5的图象,观察图象回答下列问题:
(1)x取哪些值时,2x-5>0?
(2)x取哪些值时,2x-5<0?
(3)x取哪些值时,2x-5>3?
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The second
听录音,提取课文信息:
1、What has Betty made?
2、What has Lingling made?
3、How does the cheese smell?
4、How do the chocolate cookies taste?
5、Who is going to the airport? And why?原文:
Tony: Mmm ... That smells delicious! What are you making?
Betty: Hi, guys! I've made a pizza. Have some!
Tony: OK. Yes, it's great.
Betty: What's the matter, Daming?
Daming: It tastes too strong. I'm afraid I don't like cheese. It doesn't smell fresh. No, thanks.
Lingling: Well, I've made some chocolate cookies. Have a try! They taste really sweet.
Daming: That's much better.
Betty: You're wearing a lovely sweater, Lingling.
Lingling: Yes, it feels very soft and comfortable.
Tony: You both look very smart. And so much food! Are we having a party?
Lingling: We're going to the airport to meet my friend Sally from London.
Daming: What's she like?
Lingling: I haven't met her, but she sounds really nice.
Betty: And she looks very pretty in her photo.
Tony: Let's have a look. Hm, yes, I see what you mean!
Lingling: And then we're coming back here to have something to eat.
Tony: You must introduce me to her.
Betty: Sure we will. We'll be back soon.
Lingling: See you later.-
问题情境一 2
1、兄弟俩赛跑,哥哥先让弟弟9m,然后自己才开始跑,已知弟弟每秒跑3m,哥哥每秒4m,列出函数关系式,画出函数图象,观察图象回答下列问题:
(1)何时弟弟跑在哥哥前面?
(2)何时哥哥跑在弟弟前面?
(3)谁先跑过20m?谁先跑过100m?
(4)你是怎样求解的?与同伴交流。
2、若y1=-x+3,y2=3x-4,试确定当x取何值时
(1)y1<y2?
(2)y1=y2?
(3)y1>y2?
3、甲、乙两辆摩托车从相距20km的A、B两地相向而行,图中l1、l2分别表示两辆摩托车离开A地的距离s(km)与行驶时间t(h)之间函数关系。
(1)哪辆摩托车的速度较快?
(2)经过多长时间,甲车行驶到A、B两地中点?
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The third
根据提示线索,复述课文:Keypoints : smells delisious
taste too strong
smell fresh
taste sweet
feels very soft and comfortable
look very smart
sounds really nice
looks very pretty原文提示:
Tony: Mmm ... That smells delicious! What are you making?
Betty: Hi, guys! I've made a pizza. Have some!
Tony: OK. Yes, it's great.
Betty: What's the matter, Daming?
Daming: It tastes too strong. I'm afraid I don't like cheese. It doesn't smell fresh. No, thanks.
Lingling: Well, I've made some chocolate cookies. Have a try! They taste really sweet.
Daming: That's much better.
Betty: You're wearing a lovely sweater, Lingling.
Lingling: Yes, it feels very soft and comfortable.
Tony: You both look very smart. And so much food! Are we having a party?
Lingling: We're going to the airport to meet my friend Sally from London.
Daming: What's she like?
Lingling: I haven't met her, but she sounds really nice.
Betty: And she looks very pretty in her photo.
Tony: Let's have a look. Hm, yes, I see what you mean!
Lingling: And then we're coming back here to have something to eat.
Tony: You must introduce me to her.
Betty: Sure we will. We'll be back soon.
Lingling: See you later. -
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