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一、选择题1.定义集合M与N的新运算:M*N=|x|x∈M或x∈N且x?M∩N|,则(M*N)*M=
First, multiple-choice questions 1. Define the new operation of the set M and N: M*N=|x|x∈M or x∈N and x?M∩N|, then (M*N)*M=