某市自来水公司为鼓励节约用水，采取每月分段计费的方法收取水费。15吨以内的每吨3.2元，超过15吨 (一)、某市自来水公司为鼓励节约用水，采取按月分段计费方法收...
\u67d0\u5e02\u81ea\u6765\u6c34\u516c\u53f8\u4e3a\u9f13\u52b1\u8282\u7ea6\u7528\u6c34\uff0c\u91c7\u53d6\u6309\u6708\u5206\u6bb5\u8ba1\u8d39\u7684\u65b9\u6cd5\u6536\u53d6\u6c34\u8d39\uff0e12\u5428\u4ee5\u5185\u7684\u6bcf\u54282.5\u5143\uff1b\u8d85\u8fc712\u5428\u7684\u90e8\u5206\uff081\uff092.5\u00d711=27.5\uff08\u5143\uff09\u7b54\uff1a\u5c0f\u4e91\u5bb6\u4e0a\u4e2a\u6708\u7684\u7528\u6c34\u91cf\u4e3a11\u5428\uff0c\u5e94\u7f34\u6c34\u8d3927.5\u5143\uff0e\uff082\uff092.5\u00d712+\uff0817-12\uff09\u00d73.8=30+19=49\uff08\u5143\uff09\u7b54\uff1a\u5c0f\u73b2\u5bb6\u4e0a\u4e2a\u6708\u9700\u8981\u4ea4\u8d3949\u5143\uff0e
\u8fd9\u4e24\u9898\u5747\u4e3a\u5206\u6bb5\u8ba1\u7b97\u3002
\u7b2c\u4e00\u9898\uff1a
\uff081\uff09\u5c0f\u4e91\u5bb6\u7528\u6c34\u91cf11\u5428\u572812\u5428\u4ee5\u5185\uff0c\u6240\u4ee5\u6309\u6bcf\u54282.5\u5143\u8ba1\u7b97\uff0c\u5217\u5f0f\uff1a
2.5\u00d711=27.5\uff08\u5143\uff09
\u7b54\uff1a\u5c0f\u4e91\u5bb6\u4e0a\u4e2a\u6708\u5e94\u7f34\u6c34\u8d3927.5\u5143\u3002
\uff082\uff09\u5c0f\u53ef\u5bb6\u7528\u6c34\u91cf17\u5428\u8d85\u8fc712\u5428\uff0c\u8d85\u51fa\u90e8\u5206\u9700\u6309\u6bcf\u54283.8\u5143\u8ba1\u7b97\uff0c\u5217\u5f0f\uff1a
2.5\u00d712+\uff0817-12\uff09\u00d73.8
=30+19
=49\uff08\u5143\uff09
\u7b54\uff1a\u5c0f\u53ef\u5bb6\u4e0a\u4e2a\u6708\u9700\u8981\u4ea4\u8d3949\u5143\u3002
\u7b2c\u4e8c\u9898\uff1a
\u56e0\u4e3a\u5408\u5f71\u7684\u7167\u7247\u4ef7\u94b127.5\u5143\u542b\u6709\u4e94\u5f20\u7167\u7247\uff0c\u90a3\u4e4835-5=30\u8fd8\u9700\u53e6\u4ed830\u5f20\u6bcf\u5f202.5\u5143\u3002\u5217\u5f0f\uff1a
27.5+\uff0835-5\uff09\u00d72.5
=27.5+30\u00d72.5
=27.5+75
=102.5\uff08\u5143\uff09
\u7b54\uff1a\u4e00\u5171\u9700\u8981\u4ed8102.5\u5143\u3002
\u5206\u6bb5\u8ba1\u7b97\u4f8b\u9898\uff1a
\u51fa\u79df\u8f66\u5728\u5f00\u59cb10\u5343\u7c73\u4ee5\u5185\u6536\u8d3910.4\u5143\uff0c\u4ee5\u540e\u6bcf\u8d701\u5343\u7c73\uff0c\u6536\u8d391.6\u5143\uff0c\u8bf7\u95ee\u8d7020\u5343\u7c73\u9700\u6536\u591a\u5c11\u94b1\uff1f\uff08\uff09 A. 20.8 B. 26 C. 26.4 D. 20
\uff3b\u7b54\u6848\uff3dC \uff3b\u89e3\u6790\uff3d\u24600\uff5e10\u5343\u7c73\u90e8\u5206\uff0c\u5e94\u4ed810.4\u5143\uff1b\u246110\uff5e20\u5343\u7c73\u90e8\u5206\uff0c\u5e94\u4ed810\u00d71.6=16\u5143\uff0c\u5408\u8ba126.4\u5143\u3002
2.\u67d0\u5e02\u51fa\u79df\u6c7d\u8f66\u7684\u8f66\u8d39\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a\u8def\u7a0b\u57283\u516c\u91cc\u4ee5\u5185\uff08\u542b3\u516c\u91cc\uff09\u4e3a8.00\u5143\uff1b\u8fbe\u52303\u516c\u91cc\u540e\uff0c\u6bcf\u589e\u52a01\u516c\u91cc\u65361.40\u5143\uff1b\u8fbe\u52308\u516c\u91cc\u4ee5\u540e\uff0c\u6bcf\u589e\u52a01\u516c\u91cc\u65362.10\u5143\uff0c\u589e\u52a0\u4e0d\u8db31\u516c\u91cc\u6309\u56db\u820d\u4e94\u5165\u8ba1\u7b97\u3002\u67d0\u4e58\u5ba2\u4e58\u5750\u8be5\u79cd\u51fa\u79df\u8f66\u4ea4\u4e8644.4\u5143\u8f66\u8d39\uff0c\u5219\u6b64\u4e58\u5ba2\u4e58\u8be5\u51fa\u79df\u8f66\u884c\u9a76\u7684\u8def\u7a0b\u4e3a\u591a\u5c11\u516c\u91cc\uff1f\uff08\uff09 A. 22\u516c\u91cc B. 24\u516c\u91cc C. 26\u516c\u91cc D. 29\u516c\u91cc
\uff3b\u7b54\u6848\uff3dA \uff3b\u89e3\u6790\uff3d\u8bbe\u884c\u9a76\u7684\u8def\u7a0b\u4e3ax\u516c\u91cc\uff0c\u5219\u6709\uff1a\u24600\uff5e3\u516c\u91cc\u7684\u90e8\u5206\uff0c\u5e94\u4ed88.0\u5143\uff1b\u24613\uff5e8\u516c\u91cc\u7684\u90e8\u5206\uff0c\u5e94\u4ed87.0\u5143\uff085\u00d71.40=7\uff09\uff1b\u24628\uff5ex\u516c\u91cc\u7684\u90e8\u5206\uff0c\u5e94\u4ed8 29.4\u5143 \uff0844.4-7-8=29.4\uff09\uff1b\u5219\uff08x-8\uff09\u00d72.10=29.4x=22\uff0c\u9009\u62e9A\u3002
3.\u67d0\u4e2d\u4ecb\u670d\u52a1\u673a\u6784\u6839\u636e\u670d\u52a1\u9879\u76ee\u6240\u6d89\u53ca\u7684\u91d1\u989d\u6309\u4e00\u5b9a\u6bd4\u4f8b\u6536\u53d6\u670d\u52a1\u8d39\uff0c\u5177\u4f53\u6807\u51c6\u5982\u4e0b\uff1a1\u4e07\u5143\uff08\u542b\uff09\u4ee5\u4e0b\u6536\u53d650\u5143\uff1b1\u4e07\u5143\u4ee5\u4e0a\uff0c5\u4e07\u5143\uff08\u542b\uff09\u4ee5\u4e0b\u7684\u90e8\u5206\u6536\u53d63%\uff1b5\u4e07\u5143\u4ee5\u4e0a\uff0c10\u4e07\u5143\uff08\u542b\uff09\u4ee5\u4e0b\u7684\u90e8\u5206\u6536\u53d62%\u3002\uff08\u5982\uff0c\u67d0\u4e00\u670d\u52a1\u9879\u76ee\u6240\u6d89\u53ca\u91d1\u989d\u4e3a5\u4e07\u5143\u65f6\uff0c\u5e94\u6536\u53d6\u670d\u52a1\u8d391250\u5143\uff09\u73b0\u6709\u4e00\u670d\u52a1\u9879\u76ee\u6240\u6d89\u53ca\u91d1\u989d\u4e3a10\u4e07\u5143\uff0c\u90a3\u4e48\uff0c\u6240\u6536\u53d6\u7684\u670d\u52a1\u8d39\u5e94\u4e3a\u591a\u5c11\u5143\uff1f\uff08\uff09 A. 2250\u5143 B. 2500\u5143 C. 2750\u5143 D. 3000\u5143
\uff3b\u7b54\u6848\uff3dA \uff3b\u89e3\u6790\uff3d\u24600\uff5e5\u4e07\u5143\u7684\u90e8\u5206\uff0c\u6536\u53d61250\u5143\uff08\u6761\u4ef6\u5df2\u7ed9\uff09\uff1b\u24615\uff5e10\u4e07\u5143\u7684\u90e8\u5206\uff0c\u6536\u53d650000\u00d72%\uff1d1000\u5143\u3002\u7efc\u4e0a\uff1a\u5e94\u5171\u6536\u53d6\uff1a1250+1000\uff1d2250\u5143\uff0c\u9009\u62e9A\u3002
4.\u67d0\u539f\u6599\u4f9b\u5e94\u5546\u5bf9\u8d2d\u4e70\u5176\u539f\u6599\u7684\u987e\u5ba2\u5b9e\u884c\u5982\u4e0b\u4f18\u60e0\u63aa\u65bd\uff1a \u2460\u4e00\u6b21\u8d2d\u4e70\u91d1\u989d\u4e0d\u8d85\u8fc71\u4e07\u5143\uff0c\u4e0d\u4e88\u4f18\u60e0\uff1b \u2461\u4e00\u6b21\u8d2d\u4e70\u91d1\u989d\u8d85\u8fc71\u4e07\u5143\uff0c\u4f46\u4e0d\u8d85\u8fc73\u4e07\u5143\uff0c\u7ed9\u4e5d\u6298\u4f18\u60e0\uff1b \u2462\u4e00\u6b21\u8d2d\u4e70\u91d1\u989d\u8d85\u8fc73\u4e07\u5143\uff0c\u5176\u4e2d3\u4e07\u5143\u4e5d\u6298\u4f18\u60e0\uff0c\u8d85\u8fc73\u4e07\u5143\u90e8\u5206\u516b\u6298\u4f18\u60e0\u3002 \u67d0\u5382\u56e0\u5e93\u5bb9\u539f\u56e0\uff0c\u7b2c\u4e00\u6b21\u5728\u8be5\u4f9b\u5e94\u5546\u5904\u8d2d\u4e70\u539f\u6599\u4ed8\u6b3e7800\u5143\uff0c\u7b2c\u4e8c\u6b21\u8d2d\u4e70\u4ed8\u6b3e26100\u5143\uff0c\u5982\u679c\u4ed6\u4e00\u6b21\u8d2d\u4e70\u540c\u6837\u6570\u91cf\u7684\u539f\u6599\uff0c\u53ef\u4ee5\u5c11\u4ed8\u591a\u5c11\u5143\uff1f\uff08\uff09 A. 1460\u5143 B. 1540\u5143 C. 3780\u5143 D. 4360\u5143
\uff3b\u7b54\u6848\uff3dA \uff3b\u89e3\u6790\uff3d\u7b2c\u4e00\u6b21\u4ed8\u6b3e 7800\u5143\uff0c\u56e0\u6b64\u7b2c\u4e00\u6b21\u8d2d\u4e70\u7684\u539f\u6599\u4ef7\u503c 7800\u5143\uff08\u4e0d\u6253\u6298\uff09\uff1b\u7b2c\u4e8c\u6b21\u4ed8\u6b3e26100\u5143\uff0c\u56e0\u6b64\u7b2c\u4e8c\u6b21\u8d2d\u4e70\u7684\u539f\u6599\u4ef7\u503c26100\u00f70.9\uff1d29000\u5143\uff08\u6253\u4e5d\u6298\uff09\uff1b\u6240\u4ee5\u4e24\u6b21\u8d2d\u4e70\u7684\u539f\u6599\u603b\u4ef7\u503c\u4e3a7800+29000=36800\u5143\u3002\u24600\uff5e30000\u5143\u7684\u90e8\u5206\uff0c\u5e94\u4ed830000\u00d790%=27000\u5143\uff1b\u246130000\uff5e36800\u5143\u7684\u90e8\u5206\uff0c\u5e94\u4ed86800\u00d780%=5440\u5143\u3002\u7efc\u4e0a\uff0c\u603b\u5171\u5c11\u652f\u4ed8\uff087800+26100\uff09-\uff0827000+5440\uff09=1460\u5143\u3002
5.\u67d0\u5e02\u5c45\u6c11\u751f\u6d3b\u7528\u7535\u6bcf\u6708\u6807\u51c6\u7528\u7535\u91cf\u7684\u57fa\u672c\u4ef7\u683c\u4e3a\u6bcf\u5ea60.50\u5143\uff0c\u82e5\u6bcf\u6708\u7528\u7535\u91cf\u8d85\u8fc7\u6807\u51c6\u7528\u7535\u91cf\uff0c\u8d85\u51fa\u90e8\u5206\u6309\u5176\u57fa\u672c\u4ef7\u683c\u768480%\u6536\u8d39\uff0c\u67d0\u6237\u4e5d\u6708\u4efd\u7528\u753584\u5ea6\uff0c\u5171\u4ea4\u7535\u8d3939.6\u5143\uff0c\u5219\u8be5\u5e02\u6bcf\u6708\u6807\u51c6\u7528\u7535\u91cf\u4e3a\u591a\u5c11\u5ea6\uff1f\uff08\uff09 A. 60\u5ea6 B. 65\u5ea6 C. 70\u5ea6 D. 75\u5ea6
\uff3b\u7b54\u6848\uff3dA \uff3b\u89e3\u6790\uff3d\u24600\uff5ex\u5ea6\u7684\u90e8\u5206\u5e94\u4ea4\u7eb30.5x\u5143\uff1b\u2461x\uff5e84\u5ea6\u7684\u90e8\u5206\u5e94\u4ea4\u7eb30.4\u00d7\uff0884-x\uff09\u5143\u3002\u7efc\u4e0a\uff0c\u5e94\u6709\uff1a0.5x+0.4\u00d7\uff0884-x\uff09=39.6x=60\uff0c\u9009\u62e9A\u3002
图片
绛旓細(1)11脳2.5=27.5 (2)12脳2.5+5脳3.8=49 鑷潵姘鏄寚閫氳繃鑷潵姘村鐞嗗巶鍑鍖栥佹秷姣掑悗鐢熶骇鍑烘潵鐨勭鍚堢浉搴旀爣鍑嗙殑渚涗汉浠敓娲汇佺敓浜т娇鐢ㄧ殑姘淬傜敓娲鐢ㄦ按涓昏閫氳繃姘村巶鐨勫彇姘存车绔欐辈鍙栨睙娌虫箹娉婂強鍦颁笅姘达紝鍦拌〃姘达紝鐢辫嚜鏉ユ按鍘傛寜鐓с婂浗瀹剁敓娲婚ギ鐢ㄦ按鐩稿叧鍗敓鏍囧噯銆嬶紝缁忚繃娌夋穩銆佹秷姣掋佽繃婊ょ瓑宸ヨ壓娴佺▼鐨勫鐞嗭紝鏈鍚庨...
绛旓細锛1锛2.5脳11=27.5锛堝厓锛夌瓟锛氬皬浜戝涓婁釜鏈堢殑鐢ㄦ按閲涓11鍚紝搴旂即姘磋垂27.5鍏冿紟锛2锛2.5脳12+锛17-12锛壝3.8=30+19=49锛堝厓锛夌瓟锛氬皬鐜插涓婁釜鏈堥渶瑕佷氦璐49鍏冿紟
绛旓細3.鏌愪腑浠嬫湇鍔℃満鏋勬牴鎹湇鍔￠」鐩墍娑夊強鐨勯噾棰濇寜涓瀹氭瘮渚嬫敹鍙栨湇鍔¤垂锛屽叿浣撴爣鍑嗗涓嬶細1涓囧厓锛堝惈锛変互涓嬫敹鍙50鍏冿紱1涓囧厓浠ヤ笂锛5涓囧厓锛堝惈锛変互涓嬬殑閮ㄥ垎鏀跺彇3%锛5涓囧厓浠ヤ笂锛10涓囧厓锛堝惈锛変互涓嬬殑閮ㄥ垎鏀跺彇2%銆傦紙濡锛屾煇涓鏈嶅姟椤圭洰鎵娑夊強閲戦涓5涓囧厓鏃讹紝搴旀敹鍙栨湇鍔¤垂1250鍏冿級鐜版湁涓鏈嶅姟椤圭洰鎵娑夊強閲戦涓10涓囧厓锛岄偅涔堬紝...
绛旓細锛1锛2.4脳9=21.6锛堝厓锛夌瓟锛氬皬鏄庡涓婁釜鏈堢殑鐢ㄦ按閲涓9鍚紝搴旂即姘磋垂21.6鍏冿紟锛2锛2.4脳12+3.6脳锛18-12锛=28.8+21.6=50.4锛堝厓锛夌瓟锛氬皬涓滃涓婁釜鏈堢殑鐢ㄦ按閲忎负18鍚紝搴旂即姘磋垂50.4鍏冿紟
绛旓細锛1锛夈11X2.5=27.5锛堝厓锛夌瓟锛氬皬浜戝鐨勬按璐规槸27.5鍏冦傦紙2锛夈12X2.5+3.8X(17-12)=30+3.8X5 =30+19 =49锛堝厓锛夌瓟锛氬皬鍙姘磋垂鏄49鍏冦
绛旓細鈥滄按鏄敓鍛戒箣婧愨,甯鑷潵姘村叕鍙镐负榧撳姳鐢ㄦ埛鑺傜害鐢ㄦ按,鎸変互涓嬭瀹氭敹鍙栨按璐:鐢ㄦ按閲/鏈 鍗曚綅(鍏/鍚)涓嶈秴杩40鍚ㄧ殑閮ㄥ垎 1 瓒呰繃40鍚ㄧ殑閮ㄥ垎 1. 5 鍙:姣忓惃鐢ㄦ按鍔犳敹0. 2鍏冪殑鍩庡競姹℃按澶勭悊璐(1)鏌愮敤鎴1鏈堜唤鍏变氦姘磋垂65鍏,闂1鏈堜唤鐢ㄦ按澶氬皯鍚?(2)鑻ヨ鐢... 灞曞紑 椤...
绛旓細璁:鐢ㄦ按涓簒鍚紝10脳4.5+5.5脳锛埫-10锛=72.5锛岃В:45+5.5脳-55=72.5锛5.5脳=72.5+55-45脳=82.5梅5.5锛屆=15(鍚)銆傚濂芥柟绋嬬殑鍏抽敭鏄細瑕佹湁淇″績锛屽潥鍐虫憭寮冩亹鎯с備笉瑕佷笅鎰忚瘑鍦拌涓轰綘涓嶄細鎴栬鑷繁涓鐪嬪埌绛夊紡灏辨劅鍒板洶鎯戙傚濂芥柟绋嬬殑鍏抽敭鏄褰诲簳鎺屾彙閲忕殑鍏崇郴锛岃娉ㄦ剰鎺屾彙閫忓交锛岃屼笉...
绛旓細瑙ｏ細璁捐浼佷笟涓や釜鏈堝叡鐢ㄦ按x鍚紝渚濋鎰忓緱锛 瑙ｅ緱锛歺=400 640梅400=1.6锛堝厓锛夌瓟锛氳浼佷笟涓や釜鏈堝叡鐢ㄦ按400鍚紝杩欎袱涓湀骞冲潎姘磋垂姣忓惃1.6鍏冦
绛旓細锛1锛 鏃讹紝y = 1.8 x锛 x鈮15鏃讹紝y = 2.5 x-10.5锛2锛32 = 2.5 x-10.5锛寈 =17锛岀瓟锛氳鐢ㄦ埛鏈鐢ㄦ按閲17鍚ㄣ
绛旓細锛涘綋20锛 鈮30鏃讹紝 锛涘綋 锛30鏃讹紝 = 鍗 锛3锛6540脳2%=130.8 鈭20脳2.45=49锛49锛10脳3.28=81.8鑰49锕81.8锕130.8 鈭村眳姘戠敳瀹6鏈堜唤鐢ㄦ按瓒呰繃30鍚紝璁句粬瀹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
