????×?·¨￡o1)???úó?êêá??????t?Y￡?è?è?éùDíμí·?￡??éò?óD?úóú???úμ????à?￡???úèí?ˉoó￡?31μ×???′?é???￡
2)1??Dμ1è?????′ó?e?óèè?á·Dìú￡?·?è????úìì3·??ó￡?àì3?1yà???oóá¤?é?￡
????3)?????ú?o3éD??é?￡??2??′???D3é2cm3¤μ????￡oì???·è￥μùè￥×??′??oó￡??D3é4cm3¤μ??????￡′ó?aè￥?¤￡?ó??1?a?÷?13é?a?à?￡4)?????ú￡???2???￡?oì???·??￡??a?àμ1è?ò???′óí??D￡?μ÷è?°×′×￡?3?′×￡???￡?°×ì?￡??|??￡?à±?·óíoí??óí￡??á°è?ù?è?′?é?￡