把https://bgk-photo.cdn.bcebos.com/doc/pic/item/5366d0160924ab181c8498353dfae6cd7b890b25.jpg米平均分成3份，每份是______米；4吨是______吨的40%；12米的https://bgk-photo.cdn.bcebos.com/doc/pic/item/3b87e950352ac65c1cd11f71f3f2b21192138adf.jpg和30米的https://bgk-photo.cdn.bcebos.com/doc/pic/item/cf1b9d16fdfaaf51c8ccf9bd845494eef01f7a80.jpg同样长．