某市自来水公司为了鼓励市民节约用水，采取分段收费标准，居民每月应交水费y（元）是用水量x（吨）的函数 某自来水公司为了鼓励市民节约用水，采取分段收费标准，若某用户...
\u67d0\u5e02\u81ea\u6765\u6c34\u516c\u53f8\u4e3a\u4e86\u9f13\u52b1\u5e02\u6c11\u8282\u7ea6\u7528\u6c34\uff0c\u91c7\u53d6\u5206\u6bb5\u6536\u8d39\u6807\u51c6\uff0c\u67d0\u6237\u5c45\u6c11\u6bcf\u6708\u4ea4\u6c34\u8d39y\uff08\u5143\uff09\u4e0e\u6708\u7528\u6c34\u91cf\u5982\uff08\u5428\uff09\u5206\u6790\u9898\u610f\u548c\u56fe\u793a\u53ef\u77e5\uff1a\u82e5\u6708\u7528\u6c34\u91cf\u4e0d\u8d85\u8fc7\u4e2a\u5428\uff0c\u6c34\u8d39\u4e3a\u4e5d.i\u4e2a=8.\u5b832\u5143/\u5428\uff1b\u82e5\u6708\u7528\u6c34\u91cf\u8d85\u8fc7\u4e2a\u5428\uff0c\u8d85\u8fc7\u7684\u90e8\u5206\u6c34\u8d39\u4e3ai.\u4e5d?\u4e5d.ii?\u4e2a=8.9\u5143/\u5428\uff0e\u6545\u7b54\u6848\u4e3a8.\u5b832\uff1b8.9\uff0e
\u89e3\uff1a\uff081\uff09\u8bbe\u51fd\u6570\u89e3\u6790\u5f0f\u4e3ay=kx\uff0c\u7531\u9898\u610f\u5f973.6=5k\uff0c\u89e3\u5f97k=0.72\uff0c\u2234y=0.72x\uff080\uff1cx\u22645\uff09\uff1b\u2234y=0.9x-0.9\uff08x\uff1e5\uff09\u3002\uff082\uff09x\u22645\u81ea\u6765\u6c34\u516c\u53f8\u7684\u6536\u8d39\u6807\u51c6\u662f\u6bcf\u54280.72\u5143x\uff1e5\u81ea\u6765\u6c34\u516c\u53f8\u7684\u6536\u8d39\u6807\u51c6\u662f\u6bcf\u54280.90\u5143\uff1b\uff083\uff09\u5f53y=9\u65f6\uff0c9=0.9x-0.9\uff0c x=11 \u7b54\uff1a\u82e5\u8be5\u6708\u4ea4\u6c34\u8d399\u5143\uff0c\u5219\u7528\u6c3411\u5428\u3002
解：（1）如图所示：（2）由图象可得出：当0≤x≤5时，每吨0.72元，当x＞5时，超出部分每吨0.9元．
绛旓細璁句粬瀹6鏈堢敤姘 鍚紝寰楋紝 锛65.2鈮130.8 瑙ｅ緱锛 鈮40绛旓細灞呮皯鐢插璁″垝6鏈堜唤鏈澶氱敤姘40鍚 锛
绛旓細褰0鈮鈮5鏃讹紝y=1.44x锛涜鏄庡綋鐢ㄦ按閲忎笉瓒呰繃5鍚ㄦ椂锛屾瘡鍚ㄦ按搴旂即姘磋垂鏄1.44鍏 褰搙锕5鏃讹紝y=1.8x-1.8 y=1.8(x-5)+5脳1.44 =1.8(x-5)+7.2 =1.8x-9+7.2 =1.8x-1.8 璇存槑锛岀敤姘撮噺瓒呰繃5鍚ㄦ椂锛岃秴杩5鍚ㄩ儴鍒嗘瘡鍚ㄦ按搴旂即姘磋垂1.8鍏冦
绛旓細锛2锛墄鈮5鑷潵姘村叕鍙鐨勬敹璐规爣鍑嗘槸姣忓惃0.72鍏冿紟锛6鍒嗭級x锛5鑷潵姘村叕鍙哥殑鏀惰垂鏍囧噯鏄瘡鍚0.90鍏冿紱锛7鍒嗭級锛3锛夎嫢鏌愭埛灞呮皯璇ユ湀鐢ㄦ按3.5鍚紝鍒欏簲浜ゆ按璐2.52鍏冿紟锛8鍒嗭級鑻ユ煇鎴峰眳姘戣鏈堜氦姘磋垂9鍏冿紝鍒欑敤姘11鍚紟锛9鍒嗭級
绛旓細瑙ｏ細锛1锛夊鍥炬墍绀猴細锛2锛夌敱鍥捐薄鍙緱鍑猴細褰0鈮鈮5鏃讹紝姣忓惃0.72鍏冿紝褰搙锛5鏃讹紝瓒呭嚭閮ㄥ垎姣忓惃0.9鍏冿紟
绛旓細鑻ョ敤姘翠笉瓒呰繃5鍚紝姘磋垂涓2鍏冿紡鍚紱鑻ョ敤姘磋秴杩5鍚紝瓒呰繃閮ㄥ垎鐨勬按璐逛负3.5鍏冿紡鍚ㄣ10梅5=2鍏/鍚 锛20.5-10锛壝凤紙8-5锛=3.5鍏/鍚
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0.72锛0.9
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: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a=2 锛寈=10 锛宐=3 锛屼篃鍗宠瀹氬惃鏁涓 10 鍚紝浣庝簬 10 鍚ㄧ殑姣忓惃 2 鍏冿紝瓒呰繃 10 鍚ㄧ殑锛岃秴杩囬儴鍒嗘瘡鍚 3 鍏冦傦紙2锛夌敤姘 20 鍚紝璐圭敤涓 10*2+(20-10)*3=50 鍏冦傦紙3锛夛紙涓や釜鏈堜唤寮勯鍊掍簡鍚э紵锛熷ソ濂囨摝锛29-20=9 锛9/3=3 锛屽洜姝ょ敤姘 10+3=13 鍚 銆
绛旓細瑙ｏ細锛1锛墆=0.72x锛坸鈮5锛墆=0.9x-0.9锛坸锛5锛夛紙2锛墄鈮5鑷潵姘村叕鍙鐨勬敹璐规爣鍑嗘槸姣忓惃0.72鍏冿紟x锛5鑷潵姘村叕鍙哥殑鏀惰垂鏍囧噯鏄瘡鍚0.90鍏冿紱锛3锛夋病鏈夎秴杩3.6鍚紝鎸0.72鍏冩瘡鍚紝瓒呰繃3.6鍚紝瓒呰繃閮ㄥ垎鎸0.9鍏冩敹璐癸紟鑻鏌鎴灞呮皯璇ユ湀鐢ㄦ按3.5鍚紝鍒欏簲浜ゆ按璐2.52鍏冿紟鑻ユ煇鎴峰眳姘戣鏈堜氦姘磋垂9...
