为鼓励居民节约用水,某市居民生活用水实行二级阶梯水价:每户每月用水量 为鼓励居民节约用水,某市对居民用水收费实行“阶梯水价”,按每...
\u4e3a\u9f13\u52b1\u5c45\u6c11\u8282\u7ea6\u7528\u6c34\uff0c\u67d0\u5e02\u5c45\u6c11\u751f\u6d3b\u7528\u6c34\u5b9e\u884c\u4e8c\u7ea7\u9636\u68af\u6c34\u4ef7\uff1a\u6bcf\u6237\u6bcf\u6708\u7528\u6c34\u91cf\u572822\u5428\u4ee5\u5185\u90e8\u5206\uff08\u542b22\u5428\uff09\uff0c\u6c34\u8d39\uff081\uff091.90\u00d722+\uff0825-22\uff09\u00d72.85=41.8+8.55=50.35\uff08\u5143\uff09\u7b54\uff1a\u8981\u4ea4\u6c34\u8d3950.35\u5143\uff0e\uff082\uff0922\u5428\u7684\u4ef7\u683c\u4e3a\uff1a1.90\u00d722=41.8\uff08\u5143\uff0922\u5428\u4ee5\u4e0a\u90e8\u5206\uff08\u4e0d\u542b22\u5428\uff0c\u8fd9\u90e8\u5206\u7684\u6c34\u8d39\u4e3a\uff1a58.9-41.8=17.1\uff08\u5143\uff09\u8fd9\u90e8\u5206\u7684\u7528\u6c34\u91cf\u4e3a\uff1a17.1\u00f72.85=6\uff08\u5428\uff09\u7528\u6c34\u91cf\uff1a22+6=28\uff08\u5428\uff09\uff0e\u7b54\uff1a\u5979\u5bb6\u4e0a\u6708\u7528\u6c3428\u5428\uff0e
\uff081\uff09\u5f530\u2264x\u2264180\u65f6\uff0cy=5x\uff0c\u5f53180\uff1cx\u2264260\u65f6\uff0cy=5\u00d7180+7\uff08x-180\uff09\uff0c\u5373y=7x-360\uff0c\u5f53x\uff1e260\u65f6\uff0cy=5\u00d7180+7\u00d7\uff08260-180\uff09+9\uff08x-260\uff09\uff0c\u5373y=9x-880\uff0c\u7efc\u4e0a\u6240\u8ff0\uff0cy=5x(0\u2264x\u2264180)7x?360(180\uff1cx\u2264260)9x?880(x\uff1e260)\uff1b\uff082\uff09\u5f53x=200\u65f6\uff0cy=7x-360=7\u00d7200-360=1040\uff08\u5143\uff09\uff0e\u7b54\uff1a\u6309\u201c\u9636\u68af\u6c34\u4ef7\u201d\u6536\u8d39\uff0c\u5979\u5bb6\u5e94\u7f34\u6c34\u8d391040\u5143\uff0e
(1)文文家上月共用水25吨,要交水费多少钱?22*1.9+(25-22)*2.85=50.3(元)
(2)红红家上月公交水费58.9元,她家上月用水多少吨?
58.9-22*1.9=17.1(元)
17.1/2.85=6(吨)
22+6=28(吨)
绛旓細15000*0.01=150鍏冿紝鏈澶氫娇鐢150鍏冪殑姘磋垂 鍋囪浣跨敤X鍚紝鏄庢樉X澶т簬17锛屽浐鏈17*3+锛圶-17锛*5=150 X=锛150-51+85锛/5=36.8鍚ㄣ傚笇鏈涘府鍒版偍
绛旓細锛1锛夋枃鏂囧涓婃湀鍏辩敤姘25鍚紝瑕佷氦姘磋垂澶氬皯閽憋紵22*1.9+锛25-22锛*2.85=50.3锛堝厓锛夛紙2锛夌孩绾㈠涓婃湀鍏氦姘磋垂58.9鍏冿紝濂瑰涓婃湀鐢ㄦ按澶氬皯鍚紵58.9-22*1.9=17.1锛堝厓锛17.1/2.85=6锛堝惃锛22+6=28锛堝惃锛
绛旓細锛1锛夌敱棰樻剰寰楋紝搴斾氦姘磋垂锛20脳2.3+10脳3.45+2脳4.6=89.7锛堝厓锛夛紝绛旓細灏忔槑瀹8鏈堜唤搴斾氦姘磋垂89.7鍏冿紱锛2锛夎灏忔槑瀹10鏈堜唤鐢ㄦ按x绔嬫柟绫筹紝褰撴湀鐢ㄦ按閲涓20绔嬫柟绫虫椂锛屽簲浜ゆ按璐20脳2.3=46鍏冿紱褰撴湀鐢ㄦ按閲忎负30绔嬫柟绫虫椂锛屽簲浜ゆ按璐20脳2.3+10脳3.45=80.5鍏冿紝鈭靛皬鏄庡10鏈堜唤浜ょ撼姘磋垂59.8鍏冿紝...
绛旓細3脳4+锛9-3锛壝8=12+6脳8锛=12+48锛=60锛堝厓锛夛紟绛旓細浠栧杩欎釜鏈堝簲浜ゆ按璐60鍏冿紟
绛旓細1.16鍚ㄦ按瓒呰繃浜10鍚紝涓嶅埌18鍚紝鏁10鍚ㄤ互鍐呯殑姘存瘡鍚2.2鍏冿紝鍏22鍏 瓒呰繃10鍚ㄧ殑姘存瘡鍚2.8鍏冿紝鍏2.8脳6=16.8鍏 鎬诲叡涓 22+16.8=28.8鍏 2.褰撶敤18鍚ㄦ按鏃讹紝瑕佷氦璐 22+2.8脳8=44.4鍏 鍒欎负瓒呰繃18鍚ㄩ儴鍒嗙殑姘翠粯娆句负 57.2-44.4=12.8鍏 杩欓儴鍒嗘按浣 12.8/3.2=4鍚 鏁鐢ㄦ按涓22鍚...
绛旓細锛1锛夎y=kx 甯﹀叆8.16瑙e緱K=2 璁炬甯告敹姘磋垂鏃鐢ㄦ按X鍚紝瓒呰繃姝e父鐢ㄦ按鏃舵瘡鍚ㄦ按Y鍏冿紝鍒 鏂圭▼1 2x+(12-x)y=26 鏂圭▼2 2x+(15-x)y=35 鏂圭▼2-鏂圭▼1瑙e緱x=10 y=3鈭寸敤姘翠笉瓒呰繃10鍚ㄦ椂鏀惰垂姣忓惃2鍏 瓒呭嚭鐨勬瘡鍚3鍏 锛2锛10脳2+10脳3=50(鍏冿級 锛3锛29-10脳2=...
绛旓細C 鏍规嵁棰樻剰鍒楀嚭x涓巠涔嬮棿鐨勫嚱鏁板叧绯诲紡锛屾牴鎹嚱鏁扮殑鐗圭偣瑙g瓟鍗冲彲锛 2x(0鈮锛4) 4.5x-10(x鈮4) 鐢遍鎰忕煡锛寉涓巟鐨勫嚱鏁板叧绯讳负鍒嗘鍑芥暟锛巠=鏁呴塁锛
绛旓細26-20=6 鐜嬪叺:20脳2.5+6脳3=68鍏 20脳2.5=50鍏 10脳3=30鍏 (94.5-50-30)梅3.75鈮3.87 璧靛:20+10+3.87=33.87绔嬫柟绫
绛旓細褰搙锛20鏃讹紝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...
绛旓細鍥炵瓟锛(30鍑15涔1鐐2)涔3