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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People must still read to learn, write to express thoughts or give instructions and perform basic math functions the latter, heaven forbid in their heads.

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The latter is a real possibility, because many consumers are notoriously bad at math.

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