为了鼓励市民节约用水，某市水利局对居民生活用水实行阶梯式水价计费。同时规定每吨用水量都要交纳污水处 为了鼓励市民节约用水，某市居民生活用水按阶梯式水价计费。下表...
\u4e3a\u4e86\u9f13\u52b1\u5c45\u6c11\u8282\u7ea6\u7528\u6c34,\u67d0\u5e02\u5c45\u6c11\u751f\u6d3b\u7528\u6c34\u6309\u9636\u68af\u5f0f\u6c34\u4ef7\u8ba1\u8d39\u89e3\uff1a\uff081\uff09\u7531\u9898\u610f\uff0c\u5f97
\u2461\ufe63\u2460\uff0c\u5f975\uff08b+0.8\uff09=25\uff0cb=4.2\uff0c
\u628ab=4.2\u4ee3\u5165\u2460\uff0c\u5f9717\uff08a+0.8\uff09+3\u00d75=66\uff0c
\u89e3\u5f97a=2.2
\u2234a=2.2\uff0cb=4.2\uff0e
\uff082\uff09\u5f53\u7528\u6c34\u91cf\u4e3a30\u5428\u65f6\uff0c\u6c34\u8d39\u4e3a\uff1a17\u00d73+13\u00d75=116\u5143\uff0c9200\u00d72%=184\u5143\uff0c
\u2235116\uff1c184\uff0c
\u2234\u5c0f\u738b\u5bb6\u516d\u6708\u4efd\u7684\u7528\u6c34\u91cf\u8d85\u8fc730\u5428\uff0e
\u8bbe\u5c0f\u738b\u5bb6\u516d\u6708\u4efd\u7528\u6c34\u91cf\u4e3ax\u5428\uff0c
\u7531\u9898\u610f\uff0c\u5f9717\u00d73+13\u00d75+6.8\uff08x\ufe6330\uff09\u2264184\uff0c6.8\uff08x\ufe6330\uff09\u226468\uff0c
\u89e3\u5f97x\u226440\uff0e
\u2234\u5c0f\u738b\u5bb6\u516d\u6708\u4efd\u6700\u591a\u80fd\u7528\u6c3440\u5428\uff0e
\uff081\uff09 \uff0c \uff082\uff0940 \u89e3\uff1a\uff081\uff09\u7531\u9898\u610f\uff0c\u5f97 \u2026\u2026\u2026\u2026\u2026\u20263\u5206\u2461-\u2460\uff0c\u5f97 \uff0c \u2026\u2026\u2026\u2026\u2026\u20264\u5206\u628a \u4ee3\u5165\u2460\uff0c\u5f97 \u89e3\u5f97 \u2026\u2026\u2026\u2026\u2026\u20265\u5206\u2234 \uff082\uff09\u5f53\u7528\u6c34\u91cf\u4e3a30\u5428\u65f6\uff0c\u6c34\u8d39\u4e3a\uff1a17\u00d73+13\u00d75=116\u51439200\u00d72%=184\u5143\u2235116\uff1c184\uff0c\u2234\u5c0f\u738b\u5bb6\u516d\u6708\u4efd\u7684\u7528\u6c34\u91cf\u8d85\u8fc730\u5428 \u2026\u2026\u2026\u2026\u2026\u20266\u5206\u8bbe\u5c0f\u738b\u5bb6\u516d\u6708\u4efd\u7528\u6c34\u91cf\u4e3a \u5428\uff0c\u7531\u9898\u610f\uff0c\u5f97 \u2026\u2026\u2026\u2026\u2026\u20268\u5206 \uff0c\u89e3\u5f97 \u2026\u2026\u2026\u2026\u2026\u20269\u5206\u2234\u5c0f\u738b\u5bb6\u91cc\u516d\u6708\u4efd\u6700\u591a\u80fd\u7528\u6c3440\u5428 \u2026\u2026\u2026\u2026\u2026\u202610\u5206
解：根据题意得15a+5b+20=65
15a+10b+25=85
∴a=2
b=3
11000×1.5%=165元
∵15×(2+1)+15×(3+1)=45+60=105<165
∴用水可超过30吨
（165-105）÷(5+1)=10
30+10=40
∴可用水最多40吨
绛旓細15a+10b+25=85 鈭碼=2 b=3 11000脳1.5%=165鍏 鈭15脳(2+1)+15脳(3+1)=45+60=105<165 鈭鐢ㄦ按鍙秴杩30鍚 锛165-105锛壝(5+1)=10 30+10=40 鈭村彲鐢ㄦ按鏈澶40鍚
绛旓細x=18 灏忕緤瀹7鏈堜唤璁″垝鍙敤姘:30+18=48鍚
绛旓細(2012•瀹佹尝)涓轰簡榧撳姳甯傛皯鑺傜害鐢ㄦ按,鏌愬競灞呮皯鐢熸椿鐢ㄦ按鎸夐樁姊紡姘翠环璁¤垂.濡傝〃鏄甯傚眳姘戔滀竴鎴蜂竴琛ㄢ濈敓娲荤敤姘村強鎻愮ず璁¤垂浠锋牸琛ㄧ殑閮ㄥ垎淇℃伅: 鑷潵姘撮攢鍞环鏍兼薄姘村鐞嗕环鏍 姣忔埛姣忔湀鐢ㄦ按閲忓崟浠:鍏/鍚 鍗曚环:鍏/鍚 ... 灞曞紑 w2521047983j | 娴忚88750 娆 闂鏈紑鏀惧洖绛 |涓炬姤 鎺ㄨ崘浜2017-12-16 10:06:15 鏈浣崇瓟...
绛旓細涓洪紦鍔卞眳姘戣妭绾︾敤姘达紝鏌愬競鍐冲畾瀵瑰眳姘戠敤姘存敹璐瑰疄琛屸滈樁姊环鈥濓紝鍗冲綋姣忔湀鐢ㄦ按閲忎笉瓒呰繃15鍚ㄦ椂锛堝寘鎷15鍚級锛岄噰鐢ㄥ熀鏈环鏀惰垂锛涘綋姣忔湀鐢ㄦ按閲忚秴杩15鍚ㄦ椂锛岃秴杩囬儴鍒嗘瘡鍚ㄩ噰鐢ㄥ競鍦轰环鏀惰垂锛庡皬鍏板4銆5鏈堜唤鐨勭敤姘撮噺鍙婃敹璐规儏鍐靛涓嬭〃锛氾紙1锛夋眰璇ュ競姣忓惃姘寸殑鍩烘湰浠峰拰甯傚満浠凤紙2锛夎姣忔湀鐢ㄦ按閲忎负n鍚紝搴旂即姘磋垂涓簃鍏...
绛旓細涓轰簡榧撳姳甯傛皯鑺傜害鐢ㄦ按锛屾煇甯灞呮皯鐢熸椿鐢ㄦ按鎸夐樁姊紡姘翠环璁¤垂锛庡琛ㄦ槸璇ュ競灞呮皯鈥滀竴鎴蜂竴琛ㄢ濈敓娲荤敤姘村強鎻愮ず璁¤垂浠锋牸琛ㄧ殑閮ㄥ垎淇℃伅锛氳嚜鏉ユ按閿鍞环鏍兼薄姘村鐞嗕环鏍 姣忔埛姣忔湀鐢ㄦ按閲忓崟浠凤細鍏/鍚 鍗曚环锛氬厓/鍚 17鍚ㄤ互涓 a 0.80 瓒呰繃17鍚ㄤ絾涓嶈秴杩30鍚ㄧ殑閮ㄥ垎 b 0.80 瓒呰繃30鍚ㄧ殑閮ㄥ垎 6.00 0.80 锛堣鏄庯細鈶...
绛旓細X<=20 Y = 2X X>20 Y = 2.6*X-12
绛旓細锛1锛20脳2.3锛10脳3.45锛2脳4.6锛23锛34.5锛9.2锛66.7锛堝厓锛夛紙2锛59.8-20脳2.3-10脳3.45=2.3锛堝厓锛2.3梅4.6=0.5锛堢珛鏂圭背锛30锛0.5=30.5锛堢珛鏂圭背锛
绛旓細鏍规嵁锛1锛夌殑璁＄畻缁撴灉锛岀敤姘翠负 30鍚ㄦ椂鐨勬按璐规槸 17脳2.2+(30-17)脳4.2+30脳0.80 = 116锛堝厓锛夋墍浠 6鏈堜唤鏈澶氬彲鐢ㄦ按瓒呰繃30鍚紝鍗虫渶澶氬彲鐢ㄦ按 30+(184-116)梅(6+0.80) = 40锛堝惃锛墌 婊℃剰璇烽噰绾筹紝涓嶆竻妤氳杩介棶銆--- ~ 姊崇悊鐭ヨ瘑锛屽府鍔╁埆浜猴紝鎰夋偊鑷繁銆倊 鈥滄暟鐞嗘棤闄愨濆洟闃熸杩庝綘 ~ h...
绛旓細(1)y=1.1x+0.1(0鈮鈮10)y=2(x-10)+1.1脳10+0.1=2x-8.9(x锛10)(2)鍥犱负骞冲潎姘磋垂涓烘瘡鍚1.6鍏冿紝鎵浠ヤ娇鐢▂=2x-8.9(x锛10)锛屽緱 (2x-8.9)梅x=1.6 瑙ｅ緱x=22.25
绛旓細(1)鑳¤佸笀鍥涙湀浠鐢ㄦ按18鍚紝搴斾氦姘磋垂锛18*0.75=13.5锛堝厓锛夊嚱鏁板叧绯诲紡:锛2锛墆=0.5x(x<10) y=0.75x(10<x<20)y=1.2x(20<x)(3)鑳¤佸笀浜旀湀浠界敤浜嗗灏戝惃锛氬亣璁捐儭鑰佸笀浜旀湀浠界敤X鍚ㄦ按 X/17=1.2 X=1.2*17 X=20.4鍚 ...
