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七上數學2-1質因數分解(翰)

Authored by 白 皮

Mathematics

7th Grade

Used 8+ times

七上數學2-1質因數分解(翰)
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11 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

下列敘述何者錯誤?

1 是 31 的因數

45 是 1 的倍數

0 是 53 的因數

0 是 67 的倍數

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

若 72=a×b,其中 a、b 均為正整數,則下列哪一個不可能是 a+b 之值?

17

18

22

23

3.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

在下列四個數中,哪一個不是質數?

37

47

57

67

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

(甲)所有偶數都是合數;

(乙)所有奇數都是質數;

(丙)1是質數;

(丁)20~30間共有2個質數。

以上四個敘述中,正確的有幾項?

0

1

2

3

5.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

一個保險箱的密碼是一個三位數,其個位數字為 a、十位數字為 b,百位數字為 c,且 a、b、c 隱藏在 700 的質因數分解中,700=2a×b2×c1,則此密碼為何?

257

527

725

752

6.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

若 51χ\frac{51}{\chi}  之值為整數,則滿足此條件的正整數 χ\chi  共有幾個?

4

3

2

1

7.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

已知 756 的標準分解式為 756=2a×3b×7c,則 a+b+c=?

4

5

6

7

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