高一数学集合简单问题
答案:5 悬赏:80
解决时间 2021-04-27 07:23
- 提问者网友:爱你等于作孽
- 2021-04-26 22:31
A包含于B ,A包含于C,B是{0,1,2,3,4,7,8},C是{0,3,4,7,9},则A的个数是?
最佳答案
- 二级知识专家网友:萝莉姐姐鹿小北
- 2021-04-26 22:46
{0},{3},{4},{7},{0,3},{0,4},{0,7},{3,4},{3,7},{4,7},
{0,3,4},{0,3,7},{0,4,7},{3,4,7},{0,3,4,7},还有一个是空集
全部回答
- 1楼网友:何以畏孤独
- 2021-04-27 03:08
A中的元素有0或3或4或7
2的四次方等于16个
∴A有16个
- 2楼网友:不服输就别哭
- 2021-04-27 01:50
16个
- 3楼网友:强势废物
- 2021-04-27 00:36
一、y轴正半轴上的整点(0,10) (0,9) (0,8) (0,7) (0,6) (0,5)
(0,4) (0,3) (0,2) (0,1)
共10个;
二、y轴负半轴上的整点(0,-10) (0,-9) (0,-8) (0,-7) (0,-6) (0,-5)
(0,-4) (0,-3) (0,-2) (0,-1)
共10个;
三、x轴正半轴上的整点(10,0) (9,0) (8,0) (7,0) (6,0)
(5,0) (4,0) (3,0) (2,0) (1,0)
共10个;
四、x轴负半轴上的整点(-10,0) (-9,0) (-8,0) (-7,0) (-6,0)
(-5,0) (-4,0) (-3,0) (-2,0) (-1,0)
共10个;
五、坐标原点(0,0)
共1个;
六、第一象限的正方形边上的整点(1,9) (2,8) (3,7) (4,6) (5,5) (6,4)
(7,3) (8,2) (9,1)
共9个;
七、第一象限的三角形内的整点(1,1) (1,2) (1,3) (1,4) (1,5) (1,6)
(1,7) (1,8) (2,1)
(2,2) (2,3) (2,4) (2,5) (2,6) (2,7)
(3,1) (3,2) (3,3) (3,4) (3,5) (3,6)
(4,1) (4,2) (4,3) (4,4) (4,5)
(5,1) (5,2) (5,3) (5,4)
(6,1) (6,2) (6,3)
(7,1) (7,2)
(8,1)
共36个;
八、第二象限正方形边上的整点(-1,9) (-2,8) (-3,7) (-4,6) (-5,5) (-6,4) (-7,3) (-8,2) (-9,1)
共9个;
九、第二象限三角形内的整点(-1,1) (-1,2) (-1,3) (-1,4) (-1,5) (-1,6)
(-1,7) (-1,8) (-2,1)
(-2,2) (-2,3) (-2,4) (-2,5) (-2,6) (-2,7)
(-3,1) (-3,2) (-3,3) (-3,4) (-3,5) (-3,6)
(-4,1) (-4,2) (-4,3) (-4,4) (-4,5)
(-5,1) (-5,2) (-5,3) (-5,4)
(-6,1) (-6,2) (-6,3)
(-7,1) (-7,2)
(-8,1)
共36个;
十、第三象限正边形边上的整点(-1,-9) (-2,-8) (-3,-7) (-4,-6) (-5,-5) (-6,-4) (-7,-3) (-8,-2) (-9,1)
共9个;
十一、第三象限三角形内的整点(-1,-1) (-1,-2) (-1,-3) (-1,-4) (-1,-5) (-1,-6) (-1,-7) (-1,-8)
(-2,-1) (-2,-2) (-2,-3) (-2,-4) (-2,-5) (-2,-6) (-2,-7)
(-3,-1) (-3,-2) (-3,-3) (-3,-4) (-3,-5) (-3,-6)
(-4,-1) (-4,-2) (-4,-3) (-4,-4) (-4,-5)
(-5,-1) (-5,-2) (-5,-3) (-5,-4)
(-6,-1) (-6,-2) (-6,-3)
(-7,-1) (-7,2)
(-8,-1)
共36个;
十二、第四象限正边形边上的整点(1,-9) (2,-8) (3,-7) (4,-6) (5,-5) (6,-4) (7,-3) (8,-2) (9,-1)
共9个;
十三、第四象限三角形内的整点(1,-1) (1,-2) (1,-3) (1,-4) (1,-5) (1,-6) (1,-7) (1,-8)
(2,-1) (2,-2) (2,-3) (2,-4) (2,-5) (2,-6) (2,-7)
(3,-1) (3,-2) (3,-3) (3,-4) (3,-5) (3,-6)
(4,-1) (4,-2) (4,-3) (4,-4) (4,-5)
(5,-1) (5,-2) (5,-3) (5,-4)
(6,-1) (6,-2) (6,-3)
(7,-1) (7,-2)
(8,-1)
共36个;
一至十三:(10+10+10+10) + (1) +(9+9+9+9) +(36+36+36+36)=221
答:共有221个点。
- 4楼网友:随心随缘不随便
- 2021-04-26 23:37
12个
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