算数-集合
2015-11-15 13:00
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flyfish 2015-11-15
集合(set):是具有某种特定性质的个体的全体。这样的个体称为元素,若集合包含某元素,则称该元素属于集合。
交集(intersection):由若干个集合所共有的元素所组成的集合。
并集(union):由若干个集合的所有元素所组成的集合。
一
If A is the set of even integers and B is the set of integers that are divisible by 7,which of the following integers is NOT contained in set A and is NOT contained in set B?
A是偶数集合,B是能被7整除,也就是7的倍数的集合
二
Set S contains the positive multiples of 6 that are less than 50,and set T contains the positive multiples of 8 that are less than 50. How many numbers do sets S and T have in common?
S={6,12,18,24,30,36,42,48},
T={8,16,24,32,40,48},
故它们的公共元素共有2个
三
If H is the set of prime numbers between 1 and 20 and I is the set of all positive multiples of 3 or 5,how many numbers appear in both H and I?
H={2,3,5,7,11,13,17,19},
I是3或5的正整数倍数的集合,故它们的公共元素有2个:3和5。
四
A={3,6,8,9,11,15}
B={1,4,6,8,13,17,22}
C={2,5,6,9,17,19}
Sets a,b,and c are shown above. What is the set that is the result of A∪(B∩C)?
因为B∩C={6,17},所以A∪(B∩C)={3,6,8,9,11,15,17}。
集合(set):是具有某种特定性质的个体的全体。这样的个体称为元素,若集合包含某元素,则称该元素属于集合。
交集(intersection):由若干个集合所共有的元素所组成的集合。
并集(union):由若干个集合的所有元素所组成的集合。
一
If A is the set of even integers and B is the set of integers that are divisible by 7,which of the following integers is NOT contained in set A and is NOT contained in set B?
A是偶数集合,B是能被7整除,也就是7的倍数的集合
二
Set S contains the positive multiples of 6 that are less than 50,and set T contains the positive multiples of 8 that are less than 50. How many numbers do sets S and T have in common?
S={6,12,18,24,30,36,42,48},
T={8,16,24,32,40,48},
故它们的公共元素共有2个
三
If H is the set of prime numbers between 1 and 20 and I is the set of all positive multiples of 3 or 5,how many numbers appear in both H and I?
H={2,3,5,7,11,13,17,19},
I是3或5的正整数倍数的集合,故它们的公共元素有2个:3和5。
四
A={3,6,8,9,11,15}
B={1,4,6,8,13,17,22}
C={2,5,6,9,17,19}
Sets a,b,and c are shown above. What is the set that is the result of A∪(B∩C)?
因为B∩C={6,17},所以A∪(B∩C)={3,6,8,9,11,15,17}。
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