摘要:10.对于集合P.Q.我们定义集合P - Q为P - Q = {x|x∈P, xQ},若 P ={(x,y)|x - 3y = 0}.Q = {(x,y)|2x + ky = 0}.则实数k的取值 范围是( ) A.{3} B.{k|k≠-3} C.{6} D.{k|k≠-6}
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