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Decorative element
Decorative element

数学·JJ

黄冈360°定制课时

课时18 探索规律

夯实基础

1. 想一想,填一填。

(1) 找规律,填一填。

① 1, 4, 9, 16, ( ), ( ), ( )。

② 2, 4, 7, 11, 16, ( ), ( )。

③ 2, 3, 4, 5, 8, 7, ( ), ( )。

④ 2, 4, 8, ( ), 32, 64, ( )。

\frac{1}{2} , \frac{2}{4} , \frac{()}{()} , \frac{4}{8} , \frac{()}{()} , \frac{()}{()}

(2) ☆○○☆○○☆○○……第49个图形是(
)。

(3) 假设今天是星期二,再过25天是星期(
)。

(4)

Sequence of stacks of squares forming triangular numbers: Figure 1 (1 square), Figure 2 (3 squares), Figure 3 (6 squares), Figure 4 (10 squares), followed by an ellipsis.
Sequence of stacks of squares forming triangular numbers: Figure 1 (1 square), Figure 2 (3 squares), Figure 3 (6 squares), Figure 4 (10 squares), followed by an ellipsis.

第10个图形有( )个□。

(5) 按下图的规律,第12堆里应有( )个●。

Sequence of dots forming a pattern: 1 dot, 4 dots, 9 dots, 16 dots, followed by an ellipsis.
Sequence of dots forming a pattern: 1 dot, 4 dots, 9 dots, 16 dots, followed by an ellipsis.
Sequence of hexagons: 1 hexagon, 2 hexagons, 3 hexagons, 4 hexagons, followed by an ellipsis.
Sequence of hexagons: 1 hexagon, 2 hexagons, 3 hexagons, 4 hexagons, followed by an ellipsis.
① 摆1个六边形用了6根小棒,摆2个六边形用了( )根小棒。
② 按照上面的方式继续摆下去,完成下表。
六边形个数 1 2 3
小棒根数 6 6+5 6+5 imes 2
六边形个数 4 5 ... n
小棒根数 6+5 imes 3 6+5 imes 4 ... 6+5 imes (n-1)

(7) 小明有一串珠子,按下面的顺序排列。

黄黄白白白白红黄黄白白白白红...

① 第74颗珠子是( )色的。
② 如果这串珠子共有90颗,黄珠子有( )颗,白珠子有( )颗,红珠子有( )颗。

提升能力

2. 数一数,一共有( )个长方形。

A 3x3 grid of squares.
A 3x3 grid of squares.

3.

Sequence of cubes: 1x1x1 cube, 2x2x2 cube, 3x3x3 cube, followed by an ellipsis.
Sequence of cubes: 1x1x1 cube, 2x2x2 cube, 3x3x3 cube, followed by an ellipsis.

第1个图形由1个小正方体搭成,第二个图形由8个小正方体搭成,那么第n个图形由多少个小正方体搭成?

4. 用火柴搭三角形,填写下表。

Sequence of triangles: 1 triangle, 2 triangles, 3 triangles, followed by an ellipsis.
Sequence of triangles: 1 triangle, 2 triangles, 3 triangles, followed by an ellipsis.
三角形的个数 1 2 3 4 5 ... n
火柴棒的根数 3 5 7 9 11 ... 2n+1

拓展思维

5. 下面是某月份的日历。

星期日 星期一 星期二 星期三 星期四 星期五 星期六
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30

(1) 涂色区域中5个数之和与其正中间的数有什么关系?

(2) 用含有字母的式子表示这个关系。

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