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TI技术缤纷数学QQ群(152837587)是德州仪器(TI)教育技术的官方交流群,汇集了国内外热衷于研究TI教育技术的数学教师。2012年4月上旬,群中两位教师先后提出同一个问题——如何确定一个中心对称图形
TI Technology Colorful Math QQ Group (152837587) is the official exchange group for TI’s educational technology and brings together math teachers who are passionate about TI education at home and abroad. In early April 2012, two teachers in the group successively raised the same question - how to define a center symmetrical figure