viewimage.php?id=3db5c935ecd139aa7dbcdfb018d221&no=24b0d769e1d32ca73dec80fa11d028316f56ba15eaa5e1d2899cddb8d9a53ba97a176214dc6498712e7537ae67298325d784b7fe2b88992afe14726a5b904e9fdfb5dd5b4b1016e965292fe57804425ef23804dd41115f00a02d1be5eaf956d1c9b351064492e86699fee33b9e0fc07bd3a2



dx=(x+dx)-(x)니까


d(mc^2)=(m+dm)c^2-(m)c^2=c^2dm임


이거 이해 못하면 ㄹㅈㄷ노