某自来水公司水费计算办法如下：每户每月用水不超过5吨的，每吨收费0.85元；超过5吨的，超出部分每吨收取 某自来水公司水费计算办法如下：每户每月用水不超过5吨的，每吨...
1\u3001\u67d0\u81ea\u6765\u6c34\u516c\u53f8\u6c34\u8d39\u8ba1\u7b97\u529e\u6cd5\u5982\u4e0b\uff1a\u6bcf\u6237\u6bcf\u6708\u7528\u6c34\u4e0d\u8d85\u8fc75\u5428\u7684\uff0c\u6bcf\u5428\u6536\u8d390.85\u5143\uff1b\u8d85\u8fc75\u5428\u7684\uff0c\u8d85\u51fa\u90e8\u5206\u6bcf\u5428\u65365\u00d70.85\uff1d4.25\u5143
14.6\uff0d4.25\uff1d10.35\u5143
22.65\uff0d4.25\uff1d18.4\u5143
\u5f20\u5bb6\u75285\u5428\uff0c\u5219\u674e\u5bb6\u591a\u7528\uff1a5\u00d7(3/2\uff0d1)\uff1d2.5\u5428
\u6240\u4ee5\u6bcf\u8d85\u51fa1\u5428\uff0c\u8981\u6536\u8d39\uff1a(18.4\uff0d10.35\u00d73/2)\u00f72.5\uff1d1.15\u5143
y=0.85x(x\u22645)
y\uff1d0.85*5+�*\uff08x-5\uff09\uff08x\uff1e5\uff09
∴5×0.85=4.25元当超过5吨，水费超过4.25元，
∵14.6＞4.25，
∴14.6-4.25=10.35元，
设张家用水量为2x吨，则李家为3x吨，超出部分每吨收费p元，则可列方程如下：
22.65-14.6=8.05=（3x-2x）p
14.6-8.05-0.85×5=2.3
超出部分的单价相同
| 5 | ||
1-
|
解得p=1.15．
故答案为1.15．
绛旓細鍒嗘瀽锛氳瓒呭嚭5m3鐨勯儴鍒嗘瘡绔嬫柟绫虫敹璐箈鍏冿紝浠庝氦姘磋垂鍒ゆ柇鐢ㄦ按閲忛兘瓒呰繃5m3锛屽垯寮犲褰撴湀姘撮噺涓 17.5-1.5脳5x+5锛屾潕瀹跺綋鏈堟按閲忎负 27.5-1.5脳5x+5锛屾牴鎹紶瀹剁敤姘撮噺鏄潕瀹剁敤姘撮噺鐨 23锛屽垪鏂圭▼姹傝В锛庤В绛旓細瑙ｏ細璁捐秴鍑5m3鐨勯儴鍒嗘瘡绔嬫柟绫虫敹璐箈鍏冿紝渚濋鎰忓緱锛17.5-1.5脳5x+5=23锛27.5-1.5脳5x...
绛旓細璇曢鍒嗘瀽锛氭牴鎹皬鐜嬪拰灏忔潕瀹鐨勬按鐢佃垂鐨勯噾棰濆彲鍒ゆ柇鍑轰袱瀹剁敤姘村潎瓒呰繃5绔嬫柟绫筹紟鍏抽敭鎻忚堪璇负锛氣滃皬鐜嬪鐢ㄦ按閲忔槸灏忔潕瀹剁敤姘撮噺鐨 鈥濓紱绛夐噺鍏崇郴涓猴細灏忕帇瀹惰秴鍑5绔嬫柟绫虫墍浠樼殑閽泵疯秴鍑洪儴鍒嗙殑瀹氶璐圭敤+5=锛堝皬鏉庡瓒呭嚭5绔嬫柟绫虫墍浠樼殑閽泵疯秴鍑洪儴鍒嗙殑瀹氶璐圭敤+5锛壝 锛庤В锛氳瓒呰繃5m 3 鐨勯儴鍒嗘瘡绔嬫柟绫虫敹璐箈鍏冿紟...
绛旓細瑙ｏ細璁惧皬鑾瑰鐢ㄦ按涓2X锛屽垯灏忔槑瀹剁敤姘翠负3X,瓒呭嚭5鏂归儴鍒嗘瘡鏂规敹璐逛负Y锛屽垯鍙垪鏂圭▼涓 锛2X-5锛塝+5*0.85=14.6 (3X-5)Y+5*0.85=22.65 鏂圭▼寮忕畝鍖栧悗涓猴紙2X-5锛/(3X-5)=(14.6-5*0.85)/(22.65-5*0.85)瑙ｅ嚭X=7 浠ｅ叆鏂圭▼寰楀嚭Y=1.15 瓒呭嚭5鏂圭殑閮ㄥ垎姣忔柟鏀惰垂涓1.15鍏冦傚笇鏈涜兘甯...
绛旓細瑙ｏ細鐢遍鍙互寰楀埌锛氫袱瀹剁殑鐢ㄦ按閲忛兘瓒呰繃5m³.璁捐秴鍑洪儴鍒嗘瘡绔嬫柟绫虫敹璐箈鍏冿紝寮犲鐨勭敤姘撮噺涓簓m³,鍒欐潕瀹朵负2y.鍙互寰楀埌锛5*1.5+锛坹-5锛*x=17.5 5*1.5+锛2y-5锛*x=27.5 閫氳繃鏂圭▼缁勫彲浠ュ緱鍒帮細x= y= (娉ㄩ噴锛氳В鍐鏂规硶鏄纭殑銆備絾鏄病鏈夌瓟妗堛傛晠涓汉瑙傜偣璁や负棰樹腑鐨勬暟瀛楅敊浜嗐)
绛旓細瑙ｏ細璁捐秴鍑5m 3 閮ㄥ垎鐨勬按锛屾瘡绔嬫柟绫虫敹璐硅涓簒鍏冿紝鏍规嵁绛夐噺鍏崇郴锛屽緱 瑙ｈ繖涓柟绋嬶紝寰梮=2锛岀粡妫楠寈=2鏄墍鍒楁柟绋嬬殑鏍癸紝绛旓細瓒呭嚭5m 3 閮ㄥ垎鐨勬按锛屾瘡绔嬫柟绫虫敹璐2鍏冦
绛旓細閮ㄥ垎鐨勬按姣忕珛鏂圭背鏀惰垂x鍏冿紝鍒 1鏈堜唤閮ㄥ垎鐨姘磋垂涓 (17. 5-1.5脳5)鍏冿紝瓒呭嚭5 m 3 鐨勭敤姘撮噺涓 鏉庡瓒呭嚭 5 m 3 閮ㄥ垎鐨勬按璐逛负 (27.5-1.5脳5)鍏冿紝瓒呭嚭5 m 3 鐨勭敤姘撮噺涓 鏍规嵁棰樻剰锛屽緱 锛5=( +5)脳 .瑙ｈ繖涓柟绋嬶紝寰 x=2. 缁忔楠岋紝x=2鏄墍鍒楁柟绋嬬殑鏍逛笖绗﹀悎棰樻剰.
绛旓細璁捐秴杩5m3鐨勯儴鍒嗘瘡绔嬫柟绫虫敹璐箈鍏冿紟鏍规嵁棰樻剰灏忕帇涓庡皬鏉庡鐨勭敤姘撮噺瓒呰繃5绔嬫柟绫筹紝鍙緱锛5+17.5?5脳1.5x=23脳锛5+27.5?5脳1.5x锛夛紟瑙ｅ緱锛歺=2锛庣粡妫楠岋紝x=2鏄師鏂圭▼鐨勮В锛屼笖绗﹀悎棰樻剰锛庘埓瓒呰繃5m3鐨勯儴鍒嗘瘡绔嬫柟绫虫敹璐2鍏冿紟
绛旓細瑙:璁捐秴杩5绔嬫柟绫虫敹璐规槸姣忕珛鏂圭背X鍏冿紝鍥犱负鐢ㄦ按閲忔槸5绔嬫柟绫崇殑鏀惰垂鏄5脳1.5=7.5鍏冿紝涓ゅ鐢ㄦ按閲忕殑鏀惰垂閮借秴杩囦簡7.5鍏冿紝璇存槑涓ゅ鐨勭敤姘撮噺閮借秴杩囦簡5绔嬫柟绫筹紝鍒欏皬鐜嬪2鏈堢敤姘撮噺鏄5+(17.5-5脳1.5)/X=(5+10/X)绔嬫柟绫;灏忔潕瀹2鏈堢殑鐢ㄦ按閲忔槸5+(27.5-5脳1.5)/X=(5+20/X)绔嬫柟绫筹紝鏈夋柟绋:(...
绛旓細瑙ｏ細璁捐秴杩5绔嬫柟绫虫敹璐规槸姣忕珛鏂圭背X鍏冿紝鍥犱负鐢ㄦ按閲忔槸5绔嬫柟绫崇殑鏀惰垂鏄5脳1.5=7.5鍏冿紝涓ゅ鐢ㄦ按閲忕殑鏀惰垂閮借秴杩囦簡7.5鍏冿紝璇存槑涓ゅ鐨勭敤姘撮噺閮借秴杩囦簡5绔嬫柟绫筹紝鍒欏皬鐜嬪2鏈堢敤姘撮噺鏄5+(17.5-5脳1.5)/X=(5+10/X)绔嬫柟绫筹紱灏忔潕瀹2鏈堢殑鐢ㄦ按閲忔槸5+(27.5-5脳1.5)/X=(5+20/X)绔嬫柟绫筹紝鏈夋柟绋嬶細...
绛旓細璁惧紶瀹1鏈堜唤鐢ㄦ按閲忎负2x绔嬫柟绫筹紝鏉庡涓3x绔嬫柟绫筹細5脳1.5=7.5锛堝厓锛夛紝17.5-7.5=10锛堝厓锛夛紝27.5-7.5=20锛堝厓锛夛紝鍙緱102x?5锛203x?5锛 2锛2x-5锛=3x-5锛 4x-10=3x-5锛 x=5锛10梅锛2脳5-5锛=2锛堝厓锛夛紱绛旓細瓒呭嚭5绔嬫柟绫崇殑閮ㄥ垎姣忕珛鏂圭背鏀惰垂2鍏冿紟鏁呯瓟妗堜负锛2锛
