1.用符号“属于”“不属于”“左包含”“有包含”“等于”填空
1.0____{b,a}2.空集_____R3.N_____{0,1,2,3...}
4.{1}_____N5.{0}_____{x|x|=0}6.{1,3,5...}_____{x|x=2k+1,k属于N}
2.用符号“属于”“不属于”“左包含”“有包含”“等于”填空
1.0_____空集2.0____{0}3.R____Q4.{2}____{x|x|=2}
5.{-2,2}____{x|x2-4=0}6.{x|x