小明乘坐电动扶梯下楼时，他以一定速度下行，结果走了40步就到了下一层；当他又上楼时，他走的速度是下楼

\u4e00\u90e8\u7535\u52a8\u6276\u68af\u529f\u7387\u4e00\u822c\u662f\u591a\u5c11\uff1f

\u7535\u6276\u68af\u7684\u529f\u7387\u548c\u6276\u68af\u7684\u63d0\u5347\u9ad8\u5ea6\uff1b\u68af\u7ea7\u5bbd\u5ea6\uff08\u8f93\u9001\u80fd\u529b\uff09\uff1b\u89d2\u5ea6\uff1b\u63a7\u5236\u65b9\u5f0f\uff1b\u7b49\u56e0\u7d20\u6709\u5173\uff01\u4f8b\u5982\uff1a\u73b0\u884c\u4ea7\u54c135\u5ea6\u89d2\uff0c\u63d0\u5347\u9ad8\u5ea6\u4e3a4500mm\u68af\u7ea7\u5bbd\u5ea6\u4e3a1000mm\u53d8\u9891\u63a7\u5236\u65b9\u5f0f\u7684\u7535\u6276\u68af\u4e3b\u673a\u7535\u529f\u7387\u4e3a\uff1a7.5kw\uff01\u4f9b\u4f60\u53c2\u8003\uff01

\u68af\u7ea7\u540d\u4e49\u5bbd\u5ea6\u3002\u56fd\u5185\u81ea\u52a8\u6276\u68af\u4e00\u822c\u91c7\u75280.6m\u30010.8m\u30011.0m\uff0c\u4e00\u822c\u53cc\u68af\u7684\u8bdd\u68af\u7ea7\u5bbd\u5ea6\u5e38\u75281000\uff0c\u8fd9\u6837\u7684\u8bdd\u603b\u5bbd\u5ea6\u4f1a\u8fbe\u52303400\u2014\u20143600\u5de6\u53f3\u3002

(100+40)÷(5-1)=35
40+35=75级

灏忔槑涔樺潗鐢靛姩鎵舵涓嬫ゼ鏃,浠栦互涓瀹氶熷害涓嬭,缁撴灉璧颁簡40姝ュ氨鍒颁簡涓嬩竴灞...
绛旓細40+35=75绾

灏忔槑涔樹竴閮ㄤ笅琛岀殑鑷姩鎵舵涓嬫ゼ,鍚屾椂浠栦互姣忔涓绾х殑閫熷害寰涓嬭蛋,璧颁簡50...
绛旓細搴旇涓婃ゼ涓姝ョ敤鏃朵负t,閭ｄ箞涓嬫ゼ涓姝ヤ负5t 鎵浠ワ細涓嬫ゼ鐢ㄦ椂涓50*5=250t,涓婃ゼ鐢ㄦ椂涓125t 灏忔槑涓嬫ゼ閫熷害涓猴紙V浜猴級锛屼笂妤间负锛5V浜), 鐢垫涓猴紙V锛250t*(V浜+v)=125t*锛5V浜-v锛夎В鍑烘潵 V=3V浜 璁剧數姊熷害鏄痻绾/姝ワ紙灏忔槑涓鎵舵璧颁竴姝ョ殑鏃堕棿锛夛紝鐢垫y绾 (x+1)*50=y (1*5-x)*125/5=y...

灏忔槑涔樺潗鍟嗗満鐨鑷姩鎵舵涓嬫ゼ,浠栦互姣忔涓绾х殑閫熷害寰涓嬭蛋,缁撴灉璧颁簡30姝...
绛旓細鏁呯瓟妗堜负锛60锛

灏忔槑浠庝笂鍗囩殑鑷姩鎵舵涓涓嬫ゼ,宸茬煡浠栬嚜韬殑姝ラ熶笉鍙
绛旓細璁捐嚜鍔鎵舵鐨勭骇鏁癝,鑷姩鎵舵姣忕杩愯Vt绾,灏忔槑绗璧癡绾.涓婃ゼ鏃,鐢ㄦ椂S/(Vt+V),灏忔槑璧颁簡V*S/(Vt+V)=48绾 涓嬫ゼ鏃,鐢ㄦ椂S/(V-Vt),灏忔槑璧颁簡V*S/(V-Vt)=80绾 鎵浠/48=(Vt+V)/V S/80=(V-Vt)/V S/48+S/80=2*V/V=2 S=60绾 鑷姩鎵舵鐨勭骇鏁颁负60绾 ...

鏌愬晢鍦烘湁涓鑷姩鎵舵,灏忔槑浠閫熷害v娌垮紑鍔(涓婅)鐨勮嚜鍔ㄦ壎姊蛋涓婃ゼ鏃
绛旓細璁捐嚜鍔鎵舵鐨勯熷害涓簐0锛岃嚜鍔ㄦ壎姊殑闀垮害涓篠銆傜敱棰樻剰鍙煡v>v0銆備笂妤兼椂锛歋=(v+v0)T1 涓嬫ゼ鏃锛歋=(v-v0)T2 鑱旂珛鍙緱锛歷0=v(T2-T1)/(T1+T2)

鍏充簬鑷姩鎵舵绾ф暟鐨勪唬鏁伴棶棰
绛旓細缁嗙粏鎯充竴鎯虫鏄粈涔堝惈涔夛紵鐒跺悗灏卞ソ鐞嗚В浜嗭紒姝ラ 璁句汉鐨勯熷害V1锛屾壎姊閫熷害V2锛屾瘡姝ヨ窛绂籗锛屾墍姹傛壎姊负X绾с傚垯 50/V1=(X-50)/V2 125/5V1=(125-X)/V2 瑙ｅ緱 X=100

灏忔槑浠庡悜涓嬭繍琛岀殑鑷姩鎵舵涓绾т竴绾ц蛋涓嬪幓,璧板埌涓嬮潰闇瑕佽蛋28绾;鍒颁簡...
绛旓細璁惧皬鏄庡線涓嬬殑閫熷害涓簒绾/s锛屽皬鏄寰涓婃椂鐨勯熷害灏辨槸5x绾/s銆傝闈欐鏃惰嚜鍔ㄦ壎姊湶鍦ㄥ闈㈢殑鏈塵绾с愪篃灏辨槸璇翠袱灞傛ゼ涔嬮棿鐨勮窛绂讳负m绾с锛岃嚜鍔ㄦ壎姊杩愯閫熷害涓簓绾/s锛岄偅涔堬細灏忔槑寰涓嬫椂锛歔m/(x+y)]*x=28 鎵浠ワ紝mx=28(x+y)鈥︹︹︼紙1锛夊皬鏄庡線涓婃椂锛歔m/(5x-y)]*5x=56鈥︹︹︼紙2锛夊嵆锛5mx/(...

灏忚仾浠庡悜涓嬭繍鍔ㄧ殑鑷姩鎵舵涓绾т竴绾ц蛋涓嬪幓璧板埌涓嬮潰闇瑕佹庝箞鍘诲叓鐐瑰埌...
绛旓細璁惧皬鏄庡線涓嬬殑閫熷害涓簒绾/s,灏忔槑寰涓婃椂鐨勯熷害灏辨槸5x绾/s.璁鹃潤姝㈡椂鑷姩鎵舵闇插湪澶栭潰鐨勬湁m绾с愪篃灏辨槸璇翠袱灞傛ゼ涔嬮棿鐨勮窛绂讳负m绾с,鑷姩鎵舵杩愯閫熷害涓簓绾/s,閭ｄ箞锛氬皬鏄庡線涓嬫椂锛歔m/(x+y)]*x=28 鎵浠,mx=28(x+y)鈥︹︹︼紙1锛夊皬鏄庡線涓婃椂锛歔m/(5x-y)]*5x=56鈥︹︹︼紙2锛夊嵆锛5mx/(5x-...

灏忔槑鍙戠幇鍟嗗満鐨鑷姩鎵舵鏄寑閫熻繍鍔ㄧ殑,褰浠栦互鐩稿鐢垫鎭掑畾鐨勯熷害娌夸笂琛岀殑...
绛旓細鍒嗘瀽锛氫笂鑷姩鎵舵鏃讹紝椤虹潃鐢垫璧版椂閫熷害绛変簬鐢垫閫熷害鍔犺嚜宸辫璧伴熷害涔嬪拰锛岃岄嗚鏃跺垯鏄箣宸紝鎵浠ヤ竴涓暟鐨勪负6绾т竴涓负30绾э紝渚濋鎰忎笅琛屾椂闂存槸涓婅鏃堕棿鐨5鍊嶏紝閭ｄ箞鍙煡涓嶇鏄數姊繕鏄灏忔槑涓嬭鏃剁殑绾ф暟閮芥槸涓婅鏃剁殑5鍊嶏紝鎵浠ュ皬鏄2娆¤蛋鐨勫叾瀹炲氨鏄數姊骇鏁扮殑6鍊嶃傝В锛氱數姊熷害t1锛屽皬鏄庨熷害t2锛屼竴妤煎埌浜...

灏忔槑鍘诲晢鍦鸿喘鐗,鑷姩鎵舵灏嗕粬浠庝竴妤煎寑閫熼佷笂浜屾ゼ,鍦ㄨ繖涓繃绋嬩腑,浠...
绛旓細灏忔槑鍚屽浠ュ湴闈负鍙傜収鐗╋紝鐩稿浜鑷姩鎵舵鐨勪綅缃彂鐢熶簡鏀瑰彉锛屾墍浠ヤ粬鏄繍鍔ㄧ殑锛涘皬鏄庡悓瀛︿互鑷姩鎵舵涓哄弬鐓х墿锛岀浉瀵逛簬鑷姩鎵舵鐨勪綅缃病鏈夊彂鐢熸敼鍙橈紝鎵浠ヤ粬鏄潤姝㈢殑锛庡皬鏄庡湪鎵舵鍖閫熶笂鍗囩殑杩囩▼涓紝璐ㄩ噺涓嶅彉锛岄熷害涓嶅彉锛屽姩鑳戒笉鍙橈紝閲嶅姏鍔胯兘澧炲ぇ銆佹満姊拌兘澧炲ぇ锛庢晠绛旀涓猴細鍦伴潰锛涙壎姊紱涓嶅彉锛涘澶э紟

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