
20201013數學
Quiz
•
Mathematics
•
1st - 5th Grade
•
Practice Problem
•
Hard
何欣恩 何欣恩
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14 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
哪一個不是39的質因數?
1
3
13
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
哪一個不是14的質因數?
2
14
7
3.
FILL IN THE BLANK QUESTION
1 min • 1 pt
1到20的整數中,共有( )個質數。
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下面4個數中,哪一個數和33互質?
21
30
35
77
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
有一個正整數甲,其所有正因數有:1、2、4、8、16。請問甲和24的最小公倍數是多少?
8
48
50
62
6.
FILL IN THE BLANK QUESTION
5 mins • 1 pt
水舞廣場有大、小兩個噴水池,大噴水池每18分鐘噴水一次,小噴水池每30分鐘噴水一次。上午9時30分,兩個噴水池同時噴水,下一次同時噴水是上午( )時。
7.
FILL IN THE BLANK QUESTION
5 mins • 1 pt
爸爸的辦公室長24公尺、寬18公尺,要鋪滿大小相同的正方形地毯,地毯地毯的邊長最大是( )公尺。
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