\({i}\)为虚数单位，若复数\(\left( {1 + m{\rm{i}}} \right)\left( {{\rm{i}} + 2} \right)\)是

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\({i}\)为虚数单位，若复数\(\left( {1 + m{\rm{i}}} \right)\left( {{\rm{i}} + 2} \right)\)是纯虚数，则实数\(m\)等于___．

参考答案：2