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1.因為20與12的最小公倍數為60, 所以拼成的正方形最小為60cm*60cm 需要的紙片數為正方形的面積除以原長方形紙片的面積 (60*60)/(20*15)=15片 需要的紙片數為15片 2.拼成正方形的周長為60*4=240cm
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