摘要:6.用符号或填空: 0 {0}. a {a}. Q. Z.-1 R. 0 N. 0 .
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用符号∈或∉填空:
0
3
(0,1)
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0
∈
∈
N; | 2 |
∉
∉
Z; | 1 |
| 3 |
∈
∈
Q; | 3 |
∉
∉
Q; | 12 |
∈
∈
R;3
∉
∉
{x|x=n2+1,n∈N}; 2∈
∈
{x|x2-2x=0}; 0∈
∈
{y|y=-x2+1,x∈R};(0,1)
∉
∉
{y|y=x2+1,x∈R}; (1,1)∉
∉
{(x,y)||x|=2且|y|=1}.