21.如图每一个图形都是由小三角形“ 拼成的 � � � � 观察�现第10个图形中需要 个小三角形第n个图形需要 个小三角形 Template




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Try and sketch some of thesePajamas, Crystal ball, Emu, Toes, Pug, Sprinkles, Crab trap, Tinfoil hat, Oubliette, Skydiver, view more ideas


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tomski21.如图每一个图形都是由小三角形“ 拼成的 � coloring