把一根竹竿直插入水低，竹竿湿了四十厘米！然后将竹竿倒过来，再插入，这时竹竿两次湿的部分比它的1/2 把一根竹竿直插入水底，竹竿湿了30厘米，然后将竹竿倒过来再插...
\u628a\u4e00\u6839\u7af9\u7aff\u76f4\u63d2\u5165\u6c34\u5e95\uff0c\u7af9\u7aff\u6e7f\u4e8630\u5398\u7c73\uff0c\u7136\u540e\u5c06\u7af9\u7aff\u5012\u8fc7\u6765\u518d\u63d2\u5165\u6c34\u5e95\uff0c\u8fd9\u65f6\u7af9\u7aff\u6e7f\u7684\u90e8\u5206\u6bd4\u4ed6\u7684\u4e09\u5206\u4e4b\u4e00\u957f\u56e0\u4e3a\u7af9\u7aff\u5165\u6c34\u4e24\u6b21
\u6240\u4ee5\u7b2c\u4e8c\u6b21\u7af9\u7aff\u5982\u6c34\u540e\u6e7f\u7684\u90e8\u5206\u4e3a60\u5398\u7c73
\u6240\u4ee5\u5f0f\u5b50\u53ef\u5217\u4e3a
\u8bbe\u7af9\u7aff\u957f\u4e3ax
30+30=1/3X +12
X=144
\u7b54\uff1a\u7af9\u7aff\u957f\u4e3a144cm
\u89e3\u7b54\uff1a\u7af9\u7aff\u7684\u5168\u957f\u662f144\u5398\u7c73\u3002
\u89e3\u6790\uff1a\u5df2\u77e5\u7b2c\u4e00\u6b21\u7af9\u7aff\u6e7f\u4e8630\u5398\u7c73\uff0c\u7b2c\u4e8c\u6b21\u7af9\u7aff\u6e7f\u7684\u90e8\u5206\u6bd4\u7af9\u7aff\u768413\u957f12\u5398\u7c73\uff0c\u5219\u6709\u4e0b\u5217\u7b97\u5f0f\uff1a
\uff0830\u00d72-12\uff09\u00f713
=\uff0860-12\uff09\u00d73
=48\u00d73
=144\uff08\u5398\u7c73\uff09
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\u6269\u5c55\u8d44\u6599\uff1a
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\u9009\u62e9\u7b97\u6cd5\u548c\u5217\u5f0f\u8ba1\u7b97\uff0c\u8fd9\u662f\u89e3\u7b54\u5e94\u7528\u9898\u7684\u4e2d\u5fc3\u5de5\u4f5c\u3002\u4ece\u9898\u76ee\u4e2d\u544a\u8bc9\u4ec0\u4e48\uff0c\u8981\u6c42\u4ec0\u4e48\u7740\u624b\uff0c\u9010\u6b65\u6839\u636e\u6240\u7ed9\u7684\u6761\u4ef6\u548c\u95ee\u9898\uff0c\u8054\u7cfb\u56db\u5219\u8fd0\u7b97\u7684\u542b\u4e49\uff0c\u5206\u6790\u6570\u91cf\u5173\u7cfb\uff0c\u786e\u5b9a\u7b97\u6cd5\uff0c\u8fdb\u884c\u89e3\u7b54\u5e76\u6807\u660e\u6b63\u786e\u7684\u5355\u4f4d\u540d\u79f0\u3002
40-13＝27CM，27÷2分之1＝54
54
54
绛旓細瑙ｇ瓟锛绔圭鐨勫叏闀挎槸144鍘樼背銆傝В鏋愶細宸茬煡绗竴娆绔圭婀浜30鍘樼背锛岀浜屾绔圭婀跨殑閮ㄥ垎姣旂绔跨殑13闀12鍘樼背锛屽垯鏈変笅鍒楃畻寮忥細锛30脳2-12锛壝13 =锛60-12锛壝3 =48脳3 =144锛堝帢绫筹級绛旓細绔圭鐨勫叏闀挎槸144鍘樼背銆
绛旓細鏍规嵁棰樻剰锛绔圭涓ゆ鐩存彃姘村簳宸茬粡娴告箍3.6绫筹紝浣嗘槸鍙湁绔圭鐨勪竴鍗婅繕鏈1.4绫虫槸骞茬殑锛岃鏄庝竴鍗婃槸5绫炽傛墍浠ユ妸涓鏍圭绔跨洿鎻掓按姹犲簳,娴告箍閮ㄥ垎1.8绫筹紝鎺夎繃澶存潵鐩存彃鍏ユ按姹犲簳锛屽彧鏈変竴鍗婏紝杩樻湁1.4绫虫槸骞茬殑锛岃繖鏍规潌闀10绫炽
绛旓細鍥犱负绔圭鍏ユ按涓ゆ 鎵浠ョ浜屾绔圭濡傛按鍚庢箍鐨勯儴鍒嗕负60鍘樼背 鎵浠ュ紡瀛愬彲鍒椾负 璁剧绔块暱涓簒 30+30=1/3X +12 X=144 绛旓細绔圭闀夸负144cm
绛旓細鍥炵瓟锛40-13=27CM,27梅2鍒嗕箣1=54
绛旓細绔圭鐨勫叏闀夸负 x 鍘樼背銆倄/3 + 18 = 60 x/3 = 42 x = 126 鍘樼背
绛旓細瑙ｏ細璁绔圭闀夸负 x 鍘樼背锛屽洜涓烘按娣变负30鍘樼背锛屾墍浠ユ湁 1/3x 12=30 1/3x=18 x=54 绛旓細绔圭鍏ㄩ暱涓54cm 銆
绛旓細鍥犱负绗簩娆婀鐨勫湴鏂规瘮瀹冪殑2/3灏12鍘樼背锛岃鏄庣浜屾婀跨殑闀垮害灏忎簬绔圭鎬婚暱銆傛墍浠ワ紝40鍘樼背绛変簬鎬婚暱鐨2/3鍑忓幓12鍘樼背锛(40+12)梅2/3=52脳3/2=78锛岀绔鎬婚暱78鍘樼背銆
绛旓細涓娆婀夸簡30cm锛屼袱娆″氨鏄2*30=60cm锛屾瘮浠栫殑1/3闀12锛60-12=48锛屾鏃剁瓑浜庢婚暱搴︾殑1/3锛岄偅涔堟婚暱搴︾瓑浜48*3=144cm銆
绛旓細(30脳2-12)脳3=144
绛旓細瑙ｅ緱绔圭闀跨殑涓鍗婁负40鍔40鍑6.5绛変簬73.5锛坈m锛锛岀绔闀73.5涔2绛変簬147锛坈m 锛夋眰閲囩撼鎵撳瓧瓒呯疮
