某市为了鼓励居民节约用水，采用分阶段计费的方法按月计算每户家庭的水费 某市为了鼓励居民节约用水，采用分阶段计费的方法按月计算每户家...
\uff08\u672c\u98987\u5206\uff09\u67d0\u5e02\u4e3a\u4e86\u9f13\u52b1\u5c45\u6c11\u8282\u7ea6\u7528\u6c34\uff0c\u91c7\u7528\u5206\u6bb5\u8ba1\u8d39\u7684\u65b9\u6cd5\u6309\u6708\u8ba1\u7b97\u6bcf\u6237\u5bb6\u5ead\u7684\u6c34\u8d39\uff0c\u6708\u7528\u6c34\u91cf\u4e0d\u8d85\u8fc720\u7acb\uff081\uff09y=2x\uff1by=2.6x-12\uff082\uff0955 \u8bd5\u9898\u5206\u6790\uff1a\uff081\uff09\u5f530\u2264x\u226420\u65f6\uff0cy\u4e0ex\u7684\u51fd\u6570\u8868\u8fbe\u5f0f\u662fy=2x\uff1b\u20262\u5206\u5f53x\uff1e20\u65f6\uff0cy\u4e0ex\u7684\u51fd\u6570\u8868\u8fbe\u5f0f\u662fy=2\u00d720+2.6\uff08x-20\uff09=2.6x-12\uff1b\u20262\u5206\uff082\uff09\u56e0\u4e3a\u5c0f\u660e\u5bb6\u56db\u3001\u4e94\u6708\u4efd\u7684\u6c34\u8d39\u90fd\u4e0d\u8d85\u8fc740\u5143\uff0c\u516d\u6708\u4efd\u7684\u6c34\u8d39\u8d85\u8fc740\u5143\uff0c\u6240\u4ee5\u628ay=30\u4ee3\u5165y=2x\u4e2d\uff0c\u5f97x=15\uff1b\u628ay=34\u4ee3\u5165y=2x\u4e2d\uff0c\u5f97x=17\uff1b\u628ay=47.8\u4ee3\u5165y=2.6x-12\u4e2d\uff0c\u5f97x=23\uff0e\u6240\u4ee515+17+23=55\uff0e\u7b54\uff1a\u5c0f\u660e\u5bb6\u8fd9\u4e2a\u5b63\u5ea6\u5171\u7528\u6c3455\u7acb\u65b9\u7c73\uff0e\u2026\u20263\u5206\u70b9\u8bc4\uff1a\u6b64\u7c7b\u8bd5\u9898\u5c5e\u4e8e\u96be\u5ea6\u4e00\u822c\u7684\u8bd5\u9898\uff0c\u8003\u751f\u5728\u89e3\u7b54\u6b64\u7c7b\u8bd5\u9898\u65f6\u4e00\u5b9a\u8981\u6ce8\u610f\u5206\u6790\u5404\u4e2a\u53d8\u91cf\u9636\u6bb5\u7684\u8981\u6c42\u548c\u51fd\u6570\u7684\u6c42\u6cd5
\uff081\uff09\u7531\u9898\u610f\uff0c\u5f97\u5c0f\u82b1\u5bb64\u6708\u4efd\u7528\u6c3418\u5428\u5e94\u7f34\u6c34\u8d39\u4e3a\uff1a18\u00d7=36\u5143\uff0c5\u6708\u4efd\u7528\u6c34\u91cf\u4e3a22\u5428\u65f6\uff0c\u5e94\u4ea4\u6c34\u8d39\u4e3a\uff1a20\u00d72+2.6\uff0822-20\uff09\uff0c=40+5.2\uff0c=45.2\u5143\uff0e\u6545\u7b54\u6848\u4e3a\uff1a36\uff0c45\uff0c2\uff1b\uff082\uff09\u8bbe\u5c0f\u82b1\u5bb66\u6708\u4efd\u7684\u7528\u6c34\u4e3ax\u5428\uff0c\u5219\u8d85\u8fc720\u5428\u7684\u90e8\u5206\u4e3a\uff08x-20\uff09\u5428\uff0c\u7531\u9898\u610f\uff0c\u5f9720\u00d72+2.6\uff08x-20\uff09=53\uff0c\u89e3\u5f97\uff1ax=25\uff0e\u7b54\uff1a\u5c0f\u82b1\u5bb66\u6708\u4efd\u7528\u6c3425\u5428\uff0e
1. 2x [2.6x-12] 2. 2.6*21-12=42.6
绛旓細2鍒嗗綋x锛20鏃讹紝y涓巟鐨勫嚱鏁拌〃杈惧紡鏄痽=2脳20+2.6锛坸-20锛=2.6x-12锛涒2鍒嗭紙2锛夊洜涓哄皬鏄庡鍥涖佷簲鏈堜唤鐨勬按璐归兘涓嶈秴杩40鍏冿紝鍏湀浠界殑姘磋垂瓒呰繃40鍏冿紝鎵浠ユ妸y=30浠ｅ叆y=2x涓紝寰梮=15锛涙妸y=34浠ｅ叆y=2x涓紝寰梮=17锛涙妸y=47.8浠ｅ叆y=2.6x-12涓紝寰梮=23锛庢墍浠15+17+23=55锛庣瓟锛氬皬鏄庡...
绛旓細浜旀湀浠界殑姘磋垂閮戒笉瓒呰繃40鍏冿紝鍏湀浠界殑姘磋垂瓒呰繃40鍏冿紝鎵浠ユ妸y=30浠ｅ叆y=2x涓緱锛2x=30锛寈=15锛涙妸y=34浠ｅ叆y=2x涓緱锛2x=34锛寈=17锛涙妸y=42.6浠ｅ叆y=2.6x锕12涓緱锛
绛旓細瓒呰繃5鍚ㄦ椂锛岃秴杩囬儴鍒嗙殑姣忓惃姘存敹璐癸紙20.5-10锛/(8-5)=3.5鍏 锛2锛夎嫢鏌愭埛灞呮皯鏌愭湀鐢ㄦ按3.5鍚紝涓嶈冻5鍚紝搴斾氦姘磋垂涓2*3.5=7鍏 鑻ヨ鐢ㄦ埛鏌愭湀浜ゆ按璐17鍏冿紝鍥犱负鐢5鍚ㄦ按涓10鍏冿紝瓒呰繃5鍚ㄦ寜3.5/鍚ㄨ绠楋紝锛17-10锛/3.5=2 璇ョ敤鎴峰綋鏈堢敤姘2+5=7鍚 ...
绛旓細y涓巟鐨勫嚱鏁拌〃杈惧紡鏄痽=2脳20+2.8锛坸-20锛=2.8x-16锛涳紙2锛夊洜涓哄皬棰栧浜旀湀浠界殑姘磋垂閮戒笉瓒呰繃40鍏冿紝鍥涙湀浠界殑姘磋垂瓒呰繃40鍏冿紝鎵浠ユ妸y=38浠ｅ叆y=2x涓紝寰梮=19锛涙妸y=45.6浠ｅ叆y=2.8x-16涓紝寰梮=22锛庢墍浠22-19=3鍚紟绛旓細灏忛瀹朵簲鏈堜唤姣斿洓鏈堜唤鑺傜害鐢ㄦ按3鍚紟銆愯冪偣銆...
绛旓細y=2x 褰 x>20鏃讹紝 y=2.6*锛坸-20锛+2*20 鍗 y=2.6x-12 锛2锛墄=20 绔嬫柟鏃讹紝y=40鍏冿紝鎵浠ヤ粠琛ㄤ腑鍙互鐪嬪嚭鍙湁6鏈堜唤鐢ㄦ按瓒呰繃浜20绔嬫柟 4鏈堜唤鐢ㄦ按 30=2x锛寈=15绔嬫柟 5鏈堜唤鐢ㄦ按 34=2x锛寈=17绔嬫柟 6鏈堜唤鐢ㄦ按 42.6=2.6x-50锛寈=21 杩欎釜瀛ｅ害鍏辩敤姘 15+17+21=53绔嬫柟 ...
绛旓細锛1锛夊皬鏄庡鍥涙湀浠界敤姘18绔嬫柟绫筹紝鍒欏簲浜ゆ按璐癸細18脳2=36锛堝厓锛夛紝 20脳2+锛28-20锛壝2.6=60.8锛堝厓锛夛紱鏁呯瓟妗堜负锛36锛60.8锛涳紙2锛夎姣忔埛瀹跺涵鐢ㄦ按閲忎负x绔嬫柟绫虫椂锛屽簲浜ゆ按璐箉鍏冿紟褰0鈮鈮20鏃讹紝y=2x锛 褰搙锛20鏃讹紝y=20脳2+锛坸-20锛壝2.6=2.6x-12锛涙晠绛旀涓猴細2x锛2.6x-12...
绛旓細1. 2x [2.6x-12] 2. 2.6*21-12=42.6
绛旓細锛1锛夊綋0鈮鈮20 y涓巟鐨勫嚱鏁拌〃杈惧紡涓y=2x x锛20鏃 y涓巟鐨勫嚱鏁拌〃杈惧紡涓簓=2.6(x-20) + 20*2=2.6x--12 (2)褰0鈮鈮20 0<=y<=40 2x4=30 x4=15 2*x5 =34 x5 =17 42.6>40 2.6x6-12=42.6=21 灏忔槑瀹惰繖涓搴﹀叡鐢ㄦ按x4+x5+x6=53绔嬫柟绫 ...
绛旓細2.鑻ユ瘡鏈鐢ㄦ按閲忎负20绔嬫柟绫筹紝搴斾氦澶氬皯閽憋紵锛氥3.4*20=68鍏冦3.灏忔槑绗簩瀛ｅ害缂寸撼姘磋垂鎯呭喌濡備笅銆傚洓鏈堜唤55.76鍏冿紝浜旀湀浠72.2鍏冿紝鍏湀浠61.88鍏冿紝杩欎釜瀛ｅ害鍏辩敤姘村灏戠珛鏂圭背锛燂細銆愪緷鎹甗2]锛屽彲璁68鍏冧负鍩烘暟锛屽皬浜庣瓑浜68鍏冪殑锛岄噾棰濋櫎鍗曚环鐩寸畻鏁伴噺锛屽ぇ浜68鍏冪殑鍒嗘绠楋細[55.76+68+61.88]/3.4+[72...
绛旓細1銆佽繖涓搴︿氦姘磋垂 =锛16+18+20锛壝2+锛22-20锛壝2.8 =108+5.6 =113.6鍏 2銆7鏈堜唤鐢ㄦ按=20+锛54-20脳2锛壝2.8=20+5=25绔嬫柟绫 3銆乆鈮20鏃讹紝褰撴湀姘磋垂=2X X锛20鏃讹紝褰撴湀姘磋垂=40+2.8锛圶-20锛=2.8X-16 濡傛灉鎴戠殑鍥炵瓟瀵逛綘鏈夊府鍔╋紝璇峰強鏃堕涓婊℃剰绛旀锛岃阿璋~...
