用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
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用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
1.⊆ 2.∈
用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
用符号:∈,∉,⊆,⊇; 1-{0}____{0,1} 2-4_____{x|x
1.⊆ 2.∈