如图所示是一列用若干火柴棒�成的由正三角形组成的图案1完成下表的填空正三角形个数1234 n火柴棒根数3579 2n 1 2某同学 Template




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tomski如图所示是一列用若干火柴棒�成的由正三角形组成的图案1完成下表的填空正三角形个数1234 n火柴棒根数3579 2n coloring