=1 (a) V=R2x2, U = {AEV | sled A = 0}. (b) V=R³, U= {(x, y, z) = V | 2x+y-z = 0}. (c) VR₂[x], U = {pЄ V | p(0) = 2}. (d) V=R2, U = {(a,b) € V | a = 2b}. (e) V=C², U= {(y, z) Є V | y=2z}.

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