xin.cat

xin.cat
Addition

教育
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Intuitive interface lets children play without interfering in their practice.A Proficiency Algorithm adapts the difficulty of the operations to the pl …
Multiplication

教育
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Intuitive interface lets children play without interfering in their practice.A Proficiency Algorithm adapts the difficulty of the operations to the pl …
Subtraction

教育
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Intuitive interface lets children play without interfering in their practice.A Proficiency Algorithm adapts the difficulty of the operations to the pl …
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