一桶油连桶重55.1千克，用去一半后连桶重30.1千克，桶有多重
\u4e00\u6876\u6cb9\u8fde\u6876\u91cd55.1\u5343\u514b\uff0c\u7528\u53bb\u4e00\u534a\u6cb9\u540e\uff0c\u8fde\u6876\u91cd30.1\u5343\u514b\u3002\u95ee\u6876\u6709\u591a\u91cd?\u6cb9\uff1a\uff0855.1-30.1\uff09\u00d72=50\uff08\u5343\u514b\uff09
\u6876\uff1a55.1-50=5.1\uff08\u5343\u514b\uff09
\u4f60\u597d\uff0c\u672c\u9898\u5df2\u89e3\u7b54,\u5982\u679c\u6ee1\u610f
\u8bf7\u70b9\u53f3\u4e0a\u89d2\u201c\u91c7\u7eb3\u7b54\u6848\u201d\u3002
55\u30011\u201430\u30011=25\uff08\u5343\u514b\uff09\uff0c\u8fd9\u662f\u6876\u4e2d\u6cb9\u7684\u4e00\u534a\u3002\u90a3\u4e48\u8fd9\u6876\u4e2d\u6cb9\u662f\uff1a
25\u4e582=50\uff08\u5343\u514b\uff09\uff0c\u8fd9\u662f\u6876\u4e2d\u7684\u6cb9\u3002\u6876\u91cd\uff1a
55\u30011--50=5\u30011\uff08\u5343\u514b\uff09
\u7efc\u5408\u5f0f\uff1a55\u30011\u2014[\uff0855\u30011\u201430\u30011\uff09\u4e582]=5\u30011\uff08\u5343\u514b\uff09
\u7b54\uff1a\u6876\u91cd5\u30011\u5343\u514b\u3002
x+y=55.1
x+0.5y=30.1
解x=5.1 y=50
即桶有5.1kg
55.1-（55.1-30.1）×2=5.1千克
就用55.1-30.1=25然后就用55.1-25-25=5.1所以桶重5.1千克
绛旓細娌归噸=锛55.1-30.1锛壝2=50锛鍗冨厠锛妗堕噸=55.1-50=5.1锛堝崈鍏嬶級娌规瘮妗堕噸=50-5.1=44.9锛堝崈鍏嬶級
绛旓細瑙ｏ細锛55.1-30.1锛壝2 =25脳2 =50锛鍗冨厠锛夌瓟锛氳繖妗舵补鍘熸潵閲50鍗冨厠銆傜浣犲紑蹇
绛旓細妗堕噸锛30.1脳2-55.1=5.1鍗冨厠 娌归噸锛55.1-5.1=50鍗冨厠
绛旓細娌归噸锛(55.1-30.1)x2 =25x2 =50(鍗冨厠锛妗堕噸锛55.1-50=5.1(鍗冨厠)
绛旓細娌癸細锛55.1-30.1锛壝2=50锛鍗冨厠锛妗锛55.1-50=5.1锛堝崈鍏嬶級浣犲ソ锛屾湰棰樺凡瑙ｇ瓟,濡傛灉婊℃剰 璇风偣鍙充笂瑙掆滈噰绾崇瓟妗堚濄
绛旓細璁妗涓簒锛屾补涓簓 x+y=55.1 x+0.5y=30.1 瑙=5.1 y=50 鍗虫《鏈5.1kg
绛旓細锛55.1-30.1锛壝2=25脳2=50锛堝崈鍏嬶級55.1-50=5.1锛堝崈鍏嬶級绛旓細娌归噸50鍗冨厠锛屾《閲5.1鍗冨厠锛
绛旓細璁剧┖妗堕噸x鍗冨厠锛屾补閲y鍗冨厠锛侀偅涔堟湁锛歺+y=55.1 x+0.5y=30.1 瑙ｅ緱y=50 x=5.1 鍗虫补妗堕噸5.1鍗冨厠
绛旓細娌癸細锛55.1-30.1锛壝2=50锛鍗冨厠锛妗锛55.1-50=5.1锛堝崈鍏嬶級浣犲ソ锛屾湰棰樺凡瑙ｇ瓟,濡傛灉婊℃剰 璇风偣鍙充笂瑙掆滈噰绾崇瓟妗堚濄
绛旓細30.1x2-55.1=60.2-55.1=5.1鍗冨厠绛 妗堕噸 5.1鍗冨厠
