國中數學二下1-3 Quiz: 10 Practice Questions (Grade 8)

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

等比數列 $\frac{1}{2}$ ,2,8,32,128，則其公比為何?

2

4

6

8

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

有一等比數列，公比為-4，若將此等比數列各項同乘以 $\frac{1}{4}$ ，則新數列的公比為多少?

-4

-1

1

$\frac{1}{4}$

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

若一等比數列的公比為r，則將各項的值都乘上2之後，新數列的變化為何？_x000B_

依然為等比數列，公比為r＋2

依然為等比數列，公比為2r

依然為等比數列，公比為r

不是等比數列

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

若 $1^2,x,3^2$ 三數成等比數列，則 $x$ 的值可能為何?

2²

3

5

6

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

若下列各數列都是等比數列，則何者的公比為正整數？_x000B_

4 , 6 , 9

20 , 30 , 45

4 , 8 , 16 , 32

100 , 150 , 225

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

若一個等比數列的首項為2，公比為2，求此數列的第10項為何？_x000B_

256

512

1024

2048

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

已知5 , x , 25三數成等差數列，且5 , 10 , y三數成等比數列，則x＋y＝？_x000B_

30

35

40

45

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國中數學二下1-3

等比數列 $\frac{1}{2}$ ,2,8,32,128，則其公比為何?

有一等比數列，公比為-4，若將此等比數列各項同乘以 $\frac{1}{4}$ ，則新數列的公比為多少?

若一等比數列的公比為r，則將各項的值都乘上2之後，新數列的變化為何？_x000B_

若 $1^2,x,3^2$ 三數成等比數列，則 $x$ 的值可能為何?

若下列各數列都是等比數列，則何者的公比為正整數？_x000B_

若一個等比數列的首項為2，公比為2，求此數列的第10項為何？_x000B_

已知5 , x , 25三數成等差數列，且5 , 10 , y三數成等比數列，則x＋y＝？_x000B_

若一等比數列共有5項，已知數列的第3項為4，則此數列全部5項的連乘積為何？_x000B_

已知5 , x , 20成等比數列，則5與20的等比中項x＝？_x000B_

已知一數列－2 , 6 ,－18 , 54 , a , b，依某種規律排列而成，求b－a的值為何？_x000B_

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國中數學二下1-3

等比數列 12\frac{1}{2}21​ ,2,8,32,128，則其公比為何?

有一等比數列，公比為-4，若將此等比數列各項同乘以 14\frac{1}{4}41​ ，則新數列的公比為多少?

若一等比數列的公比為r，則將各項的值都乘上2之後，新數列的變化為何？_x000B_

若 12,x,321^2,x,3^212,x,32 三數成等比數列，則 xxx 的值可能為何?

若下列各數列都是等比數列，則何者的公比為正整數？_x000B_

若一個等比數列的首項為2，公比為2，求此數列的第10項為何？_x000B_

已知5 , x , 25三數成等差數列，且5 , 10 , y三數成等比數列，則x＋y＝？_x000B_

若一等比數列共有5項，已知數列的第3項為4，則此數列全部5項的連乘積為何？_x000B_

已知5 , x , 20成等比數列，則5與20的等比中項x＝？_x000B_

已知一數列－2 , 6 ,－18 , 54 , a , b，依某種規律排列而成，求b－a的值為何？_x000B_

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Popular Resources on Wayground

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等比數列 $\frac{1}{2}$ ,2,8,32,128，則其公比為何?

有一等比數列，公比為-4，若將此等比數列各項同乘以 $\frac{1}{4}$ ，則新數列的公比為多少?

若 $1^2,x,3^2$ 三數成等比數列，則 $x$ 的值可能為何?