如图,古希腊人常用小石子在沙滩上�成各种形状来研究数.例如:称图中的数1,5,12,22…为五边形数,则第7个五边形数是( Template


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tomski如图,古希腊人常用小石子在沙滩上�成各种形状来研究数.例如:称图中的数1,5,12,22…为五边形数,则第7个五边形数是( coloring