It is argued that activity especially math activity includes two types: presentational operation and operation of thought, the latter is the main part of math activity.
指出：活动，尤其是数学活动包括两种类型：表象操作和思维运算，并强调：思维运算活动是数学活动的主要部分。
It is argued that activity especially math activity includes two types: presentational operation and operation of thought, the latter is the main part of math activity.
指出：活动，尤其是数学活动包括两种类型：表象操作和思维运算，并强调：思维运算活动是数学活动的主要部分。
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