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b) -1∈R
c) 4∈N
d) -√3∈R
e) √2+1∉W
f) (√2+3)(√2-3)=2-9=-7 (√2+3)(√2-3)∈W
g) ¹³/₂∈W
h) -√8/3√2=-²/₃ -√8/3√2∈W
i) 1/√3∉W
j) -3√27/√3=-3√9=-9 -3√27/√3∈C