某市自来水公司，为鼓励居民节约用水，采用分段计费的方法计算水费，收费标准如表所示： 某市自来水公司为鼓励居民节约用水，采取按月用水量分段收费，方...
(\u4e00)\u3001\u67d0\u5e02\u81ea\u6765\u6c34\u516c\u53f8\u4e3a\u9f13\u52b1\u8282\u7ea6\u7528\u6c34\uff0c\u91c7\u53d6\u6309\u6708\u5206\u6bb5\u8ba1\u8d39\u65b9\u6cd5\u6536\u53d6\u6c34\u8d39\u300212\u5428\u4ee5\u5185\u7684\u6bcf\u54282.5\u5143\uff0c\u8d85\u8fc7\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
\u67d0\u5e02\u81ea\u6765\u6c34\u516c\u53f8\u4e3a\u9f13\u52b1\u5c45\u6c11\u8282\u7ea6\u7528\u6c34\uff0c\u91c7\u7528\u6309\u6708\u5206\u6bb5\u7684\u65b9\u6cd5\u6536\u53d6\u6c34\u8d39\u300212\u5428\u4ee5\u5185\u542b12\u5428\u7684\u6bcf\u54282.5\u5143\u3002\u8d85\u8fc712\u5428\u7684\u90e8\u5206\u6bcf\u54283.8\u5143\u3002\u5c0f\u5f3a\u5bb6\u4e0a\u4e2a\u6708\u7eed\u6c34\u8d3941.4\u5143\u3002\u5c0f\u5f3a\u5bb6\u4e0a\u4e2a\u6708\u7528\u6c34\u91cf\u662f\u591a\u5c11\uff1f
\uff081\uff092.5\u00d712=30\uff08\u5143\uff09
41.4-30=11.4\uff08\u5143\uff0911.4/3.8=3\uff08\u5428\uff09
\u7b54\uff1a\u5c0f\u5f3a\u5bb6\u4e0a\u4e2a\u6708\u7528\u6c34\u91cf\u662f3\u5428\u3002
| （1）12×2.00+6×2.50+2×3.00=45（元）（6分） （2）∵22＜12×2.00 ∴22÷2.00=11（度）（3分） ∵34＞12×2.00 ∴12×2.00+（x-12）×2.50=34 ∴x=16（度）（3分） ∵54＞12×2.00+6×2.50 ∴12×2.00+6×2.50+（x-18）×3.00=54 ∴x=23（度） ∴11+16+23=50（度）．（3分） |
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绛旓細(1)11脳2.5=27.5 (2)12脳2.5+5脳3.8=49 鑷潵姘存槸鎸囬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殑姘淬傜敓娲荤敤姘翠富瑕侀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〃姘达紝鐢鑷潵姘村巶鎸夌収銆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...
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绛旓細锛1锛変粠琛ㄤ腑鍙互鐪嬪嚭瑙勫畾鍚ㄦ暟浣嶄笉瓒呰繃10鍚紝10鍚ㄤ互鍐咃紝姣忓惃2鍏冿紝瓒呰繃10鍚ㄧ殑閮ㄥ垎姣忓惃3鍏冿紝锛2锛夊皬鏄庡6鏈堜唤鐨勬按璐规槸锛10脳2+锛20-10锛壝3=50鍏冿紱锛3锛夎灏忔槑瀹7鏈堜唤鐢ㄦ按x鍚紝29锛10脳2锛屾墍浠锛10锛庢墍浠ワ紝10脳2+锛坸-10锛壝3=29锛岃В寰楋細x=13锛庡皬鏄庡7鏈堜唤鐢ㄦ按13鍚紟
绛旓細绛旓細锛1锛変笉瓒5鍚ㄦ椂锛屾瘡鍚ㄦ按鏀惰垂10/5=2鍏冿紱瓒呰繃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鏈堢敤姘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...
绛旓細璁捐繖鎴灞呮皯鍘诲勾12鏈堜唤瀹為檯鐢ㄦ按xm 3 锛庘埖1.5脳10=15锛36锛屸埓x锛10锛庣敱棰樻剰锛屾湁1.5脳10+3锛坸-10锛=36锛岃В寰楋細x=17锛庢晠閫塁锛
绛旓細锛涳紙2锛夎鍑芥暟瑙ｆ瀽寮忎负y=ax+b锛岀敱棰樻剰寰楋細5a+b锛3.68a+b锛6.3锛岃В寰楋細a锛0.9b锛?0.9锛屸埓y=0.9x-0.9锛坸锛5锛夛紱锛3锛夊綋x=3.5鏃讹紝y=0.72脳3.5=2.52鍏冿紱褰搚=9鏃讹紝9=0.9x-0.9锛寈=11绛旓細鐢ㄦ埛灞呮皯璇ユ湀鐢ㄦ按3.5鍚紝搴斾氦姘磋垂2.52鍏冿紱鑻ヨ鏈堜氦姘磋垂9鍏冿紝鍒欑敤姘11鍚紟
绛旓細瑙ｏ細锛1锛夊綋 鏃讹紝瀹冩槸姝ｆ瘮渚嬪嚱鏁 璁句护x=15锛寉=27寰 27=k脳15 鈭 鈭 鈭靛綋 锛屽畠鏄竴娆″嚱鏁般 璁緔=mx+b浠ｅ叆x=15锛寉=27鍜寈=20锛寉=39.5寰 鈭 鈭 鈭 锛2锛夊綋x=21鏃讹紝搴斾氦姘磋垂y=2.5脳21-10.5=42锛堝厓锛
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 鏁呯敤姘翠负22鍚...
