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初二数学课件. 钟祥市罗集一中. 变化的鱼. 授课教师:. y. 在直角坐标系内描出下列各点 : (0 , 0) , (5 , 4) , (3 , 0) , (5 , 1) , (5 , -1) , (3 , 0) , (4 , -2) , (0 , 0) 并用线段依次连接起来。 观察所得图形,你觉得它像什么?. 8 7 6 5 4 3 2 1. o. 1 2 3 4 5 6 7 8 9 10 11. x. -1 -2 -3 -4. y. 8 7 6 5 4 3 2 1.

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slide1
初二数学课件

钟祥市罗集一中

slide2
变化的鱼

授课教师:

slide3
y

在直角坐标系内描出下列各点:

(0,0),

(5,4),

(3,0),

(5,1),

(5,-1),

(3,0),

(4,-2),

(0,0)并用线段依次连接起来。观察所得图形,你觉得它像什么?

8

7

6

5

4

3

2

1

.

.

.

.

.

o

1 2 3 4 5 6 7 8 9 10 11

x

-1

-2

-3

-4

.

slide4
y

8

7

6

5

4

3

2

1

将上图中的点:

(0,0),

(5,4),

(3,0),

(5,1),

(5,-1),

(3,0),

(4,-2),

(0,0)

做如下变化:

.

.

.

.

.

o

1 2 3 4 5 6 7 8 9 10 11

x

-1

-2

-3

-4

.

slide5
y

8

7

6

5

4

3

2

1

1、纵坐标保持不变,橫坐标分别变成原来的2倍。再将所得点用线段依次连结起来,所得的图形与原来的图形相比有什么变化?

.

.

.

.

.

.

.

.

变化二

.

.

o

1 2 3 4 5 6 7 8 9 10 11

x

变化三

-1

-2

-3

-4

.

.

变化四

slide6
y

8

7

6

5

4

3

2

1

2、纵坐标保持不变,橫坐标分别加3。再将所得的点用线段依次连接起来。所得的图案与原来的图案相比有什么变化?

.

.

.

.

.

.

.

.

变化一

.

.

o

1 2 3 4 5 6 7 8 9 10 11

x

变化三

-1

-2

-3

-4

.

.

变化四

slide7
y

8

7

6

5

4

3

2

1

3、橫坐标保持不变,纵坐标乘以-1,所得的图案与原来的图案相比有什么变化?

.

.

.

.

.

.

.

.

变化一

.

.

o

1 2 3 4 5 6 7 8 9 10 11

x

变化二

-1

-2

-3

-4

.

变化四

.

slide8
.

y

8

7

6

5

4

3

2

1

4、橫、纵坐标分别变成原来的2倍,所得的图案与原来相比有什么变化?

.

.

.

.

.

.

.

变化一

.

o

1 2 3 4 5 6 7 8 9 10 11

x

变化二

-1

-2

-3

-4

.

.

变化三

.

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