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要使表面積新增的最大,那麼鋸成的截面要儘量大. 鋸成的截面最大是長20釐米,寬5釐米的矩形. 所以鋸成的截面的面積最大是20×5=100平方釐米. 又因為把一根木料鋸成2段,表面積會多出兩個截面. 所以表面積最大新增100×2=200平方釐米
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