如图,用火柴棒�出一系列三角形图案,按这种方式�下去,当�到20层n=20时,需要多�根火柴? 解:31 2 3 … 20=630 Template




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tomski如图,用火柴棒�出一系列三角形图案,按这种方式�下去,当�到20层n=20时,需要多�根火柴? 解:31 2 coloring