七上數學2-1質因數分解(翰)
Quiz
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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11 questions
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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 之值為整數,則滿足此條件的正整數 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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