行程问题（ST图）学而思的 小学奥数体系 学而思 关于行程问题的图解法 最好柳卡图或者线...
\u884c\u7a0b\u95ee\u9898\uff08\u5b66\u800c\u601d\u7684\uff09\uff08ST\u56fe\uff09C
(1)
\u7b2c\u4e00\u6b21\u76f8\u9047\u7532\u884c\u9a76\u4e8623\u5343\u7c73\uff0c\u4e59\u8f66\u884c\u9a76\u4e8655-23=32\u5343\u7c73
\u7b2c\u4e8c\u6b21\u76f8\u9047\u7532\u884c\u9a76\u4e8623*3=69\u5343\u7c73
\u6240\u4ee5\u8ddd\u79bbB\u573069-55=14\u5343\u7c73
\u7b2c\u516d\u6b21\u76f8\u9047\u7532\u4e59\u5408\u8d70\u4e862*\uff086-1\uff09+1=11\u4e2aAB\u4e24\u5730\u8ddd\u79bb\uff0c\u5219\u7532\u8d70\u4e8623*11=253\u5343\u7c73
253/55=4\u4f5933\u5343\u7c73
\u5373\u7532\u8d70\u4e86\u4e24\u4e2a\u6765\u56de\u591a33\u5343\u7c73
\u6240\u4ee5\u7b2c\u516d\u6b21\u76f8\u9047\u70b9\u8dddA\u573033\u5343\u7c73
(2)
1/\uff08X+2)\u8868\u793a\u7532\u4e00\u5c0f\u65f6\u8d70\u4e86\u5168\u7a0b\u7684\uff08X+2)\u5206\u4e4b1
\u5373\u4e59\u51fa\u53d1\u65f6 \uff0c\u4e24\u4eba\u76f8\u8ddd\u5168\u7a0b\uff08X+2)\u5206\u4e4b1
\u4e59\u6bcf\u5c0f\u65f6\u6bd4\u7532\u591a\u8d70\u5168\u7a0b\u76841/X-1/(X+2)=2/[x(x+2)]
\u6240\u4ee5\u4e59\u8ffd\u4e0a\u7532\u7528\u65f61/\uff08x+2)\u00f72/[x(x+2)]
=x/2\u5c0f\u65f6
\u6240\u4ee5\u5728X/2\u00f7X=1/2
\u5373\u4e59\u5728AB\u4e24\u5730\u7684\u4e2d\u70b9\u8ffd\u4e0a\u7532
(3)
6\u5c0f\u65f6\u7532\u7684\u8def\u7a0b\uff1a52*6=312\u7c73
6\u5c0f\u65f6\u4e59\u8d70\u7684\u8def\u7a0b\uff1a40*6=240\u7c73
\u7532\u6bd4\u4e59\u591a\u884c\u7684\u8def\u7a0b\uff1a\u4e5f\u5c31\u662f\u7b2c\u4e00\u6b21\u7532\u8981\u5230\u8fbeB\u5730\u4e4b\u540e\uff0c\u518d\u8fd4\u56de\u4e0e\u4e59\u76f8\u9047\u591a\u8d70\u7684\u8def\u7a0b\uff1a
312-210=102\u7c73
6\u6b21\u591a\u884c\uff1a102*6=612\u7c73
\u7532\u548c\u4e59\u5171\u884c\u4e86\uff1a312+240=552\u7c73
\u7b2c\u4e00\u6b21\u8981\u591a\u884c\uff1a\uff08612-552\uff09/6=60/6=10\u7c73
102-10=92\u7c73
\u7b54\uff1aAB\u4e24\u5730\u76f8\u8ddd92\u7c73.
(4)
\u5206\u6790\uff1a
1\u3001\u7b2c1\u6b21\u76f8\u9047\uff0c\u7532\u4e59\u5408\u8dd11\u4e2a\u5168\u7a0b\uff0c\u6b64\u540e\u7684\u76f8\u9047\uff0c\u7532\u4e59\u6bcf\u6b21\u90fd\u662f\u5728\u4e0a\u4e00\u6b21\u76f8\u9047\u7684\u57fa\u7840\u4e0a\u518d\u8dd12\u4e2a\u5168\u7a0b\u3002
2\u3001\u8dddA\u5730\u6700\u8fd1\uff0c\u5c31\u662f\u8ba8\u8bba\u76f8\u9047\u65f6\uff0c\u7532\u6216\u4e59\u8dd1\u7684\u8ddd\u79bb\u4e0e4800\u7684\u500d\u6570\u7684\u6700\u63a5\u8fd1\u503c\u3002
\u89e3\u7b54\uff1a
35\u5206\u949f\uff0c\u7532\u4e59\u5171\u8dd1\u4e86(300+240)\u00d735=18900\u7c73\uff0c(18900-2400)\u00f74800=3.4375\uff0c\u5171\u76f8\u9047\u4e861+3=4\u6b21
\u7b2c1\u6b21\u76f8\u9047\uff0c\u7532\u5171\u8dd1\u4e862400\u00f7(300+240)\u00d7300=4000/3\u7c73\uff0c\u79bbA\u57304000/3\u7c73
\u7b2c2\u6b21\u76f8\u9047\uff0c\u7532\u5171\u8dd1\u4e863\u00d74000/3=4000\u7c73\uff0c2400<4000<4800\uff0c\u5dee800\u7c73\u8fd4\u56deA\u5730\uff0c\u79bbA\u57304800-4000=800\u7c73
\u7b2c3\u6b21\u76f8\u9047\uff0c\u7532\u5171\u8dd1\u4e865\u00d74000/3=20000/3\u7c73\uff0c4800<4000<7200\uff0c\u8fd4\u56deA\u5730\u540e\u518d\u6298\u8fd4\u8dd1\u4e865600/3\u7c73\uff0c\u79bbA\u573020000/3-4800=5600/3\u7c73
\u7b2c4\u6b21\u76f8\u9047\uff0c\u7532\u5171\u8dd1\u4e867\u00d74000/3=28000/3\u7c73\uff0c7200<4000<9600\uff0c\u5dee800/3\u7c73\u7b2c\u4e8c\u6b21\u8fd4\u56deA\u5730\uff0c\u79bb A\u57309600-28000/3=800/3\u7c73
\u7b54\u6848\uff1a \u7532\u4e59\u5728\u7b2c4\u6b21\u76f8\u9047\u65f6\u8dddA\u5730\u6700\u8fd1\uff0c\u6700\u8fd1\u8ddd\u79bb\u4e3a800/3\u7c73\u3002
绛旓細ST鍥涔熷彲浠ワ紝浠婃櫄9鐐瑰墠鎬ラ渶锛侀棶棰樿ˉ鍏咃細璋㈣阿澶у浜嗐 (1) 绗竴娆＄浉閬囩敳琛岄┒浜23鍗冪背锛屼箼杞﹁椹朵簡55-23=32鍗冪背 绗簩娆＄浉閬囩敳琛岄┒浜23*3=69鍗冪背
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绛旓細绗竴娆＄浉閬囩敳琛岄┒浜23鍗冪背锛屼箼杞﹁椹朵簡55-23=32鍗冪背 绗簩娆＄浉閬囩敳琛岄┒浜23*3=69鍗冪背 鎵浠ヨ窛绂籅鍦69-55=14鍗冪背 绗叚娆＄浉閬囩敳涔欏悎璧颁簡2*锛6-1锛+1=11涓狝B涓ゅ湴璺濈锛屽垯鐢茶蛋浜23*11=253鍗冪背 253/55=4浣33鍗冪背 鍗崇敳璧颁簡涓や釜鏉ュ洖澶33鍗冪背 鎵浠ョ鍏鐩搁亣鐐硅窛A鍦33鍗冪背 (2)1/锛圶+2)...
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