如图，沿着边长为90米的正方形，A、B、C、D、A、B、C.......的方向，甲以每分钟65米的
\u5982\u56fe\uff0c\u4e24\u4eba\u6cbf\u7740\u8fb9\u957f\u4e3a90\u7c73\u7684\u6b63\u65b9\u5f62\u884c\u8d70\uff0c\u6309A\u2192B\u2192C\u2192D\u2192A\u2026\u65b9\u5411\uff0c\u7532\u4eceA\u4ee565\u7c73/\u5206\u5f53\u4e59\u7b2c\u4e00\u6b21\u8ffd\u4e0a\u7532\u65f6\u5728\u6b63\u65b9\u5f62\u7684DA\u8fb9\u4e0a\u3002
\u89e3\u6790\uff1a\uff0890\u00d73\u00f77\uff09\u00d765\u00f7\uff0890\u00d74\uff09
=\uff08270/7\uff09\u00d765\u00f7360
=6\uff0881/84\uff09
3/4\uff1c81/84\uff1c1\uff0c\u5219\u5f53\u4e59\u7b2c\u4e00\u6b21\u8ffd\u4e0a\u7532\u65f6\u5728\u6b63\u65b9\u5f62\u7684DA\u8fb9\u4e0a\u3002
\u9664\u6cd5\u6027\u8d28\uff1a
1\u3001\u88ab\u9664\u6570\u6269\u5927\uff08\u7f29\u5c0f\uff09n\u500d\uff0c\u9664\u6570\u4e0d\u53d8\uff0c\u5546\u4e5f\u76f8\u5e94\u7684\u6269\u5927\uff08\u7f29\u5c0f\uff09n\u500d\u3002
2\u3001\u9664\u6570\u6269\u5927\uff08\u7f29\u5c0f\uff09n\u500d\uff0c\u88ab\u9664\u6570\u4e0d\u53d8\uff0c\u5546\u76f8\u5e94\u7684\u7f29\u5c0f\uff08\u6269\u5927\uff09n\u500d\u3002
3\u3001\u9664\u6cd5\u7684\u6027\u8d28\uff1a\u88ab\u9664\u6570\u8fde\u7eed\u9664\u4ee5\u4e24\u4e2a\u9664\u6570\uff0c\u7b49\u4e8e\u9664\u4ee5\u8fd9\u4e24\u4e2a\u9664\u6570\u4e4b\u79ef\u3002
D\u3001DA\u8fb9\u4e0a
90/\uff0890-65\uff09\uff1d3.6\uff083\u520636\u79d2\uff09\u7532\u5728DA\u8fb9\u4e0a\u3002
57X-45X=90×3
解得X=22.5
然后 求甲走的路程 45×22.5=1012.5
1012.5÷360=2.8125
(3-2.8125)*90=16.875
即距D点16.875 追上的
绛旓細脳3=270绫筹紝涓や汉鐨勯熷害宸瘡鍒嗛挓72-63=9绫筹紝270梅9=30鍒嗛挓鍒30鍒嗛挓鐢茶浜63脳30=1890绫筹紝1890梅90=21涓杈归暱锛鍗虫鏃剁敳琛屼簡浜斾釜鍛ㄩ暱鍔犱竴涓竟闀挎墍浠ョ涓娆¤拷涓婄敳鏃舵槸鍦姝ｆ柟褰鐨勯《鐐笰B澶勩傝В绛旓細锛90脳3)梅锛72-63)脳63梅90=270梅9脳63梅90 =21锛堜釜锛21梅4=5锛堝懆)鈥︹1涓 鍗虫鏃剁敳琛...
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绛旓細锛1锛夎涔欑涓娆¤拷涓婄敳鐢ㄤ簡x鍒嗛挓锛岀敱棰樻剰寰楋細72x=65x+90脳3锛岃В寰楋細x=2707锛岃72脳2707=7脳360+267脳90锛庣瓟锛氫箼绗竴娆¤拷涓婄敳鏄湪AD杈逛笂锛庢晠绛旀涓猴細D锛庯紙2锛変粬浠細鍦姝ｆ柟褰鐨勯《鐐瑰鐩搁亣锛庣悊鐢辨槸锛氬洜涓轰袱涓汉鐨勯熷害涔嬪樊鏄72-65=7绫/鍒嗭紝鍙堢敳涔欏嚭鍙戞椂锛屼箼钀藉悗鐢270绫筹紝鎵浠ヤ袱涓汉濡...
绛旓細涔欒拷涓婄敳鏃讹紝鐢茶浜嗭細65脳[270梅锛72-65锛塢=65脳 270 7 锛= 17550 7 锛堢背锛夛紱鍗崇敳琛屼簡锛 17550 7 梅锛90脳4锛=6 27 28 锛堝懆锛夛紱鍙 1锛 27 28 锛 3 4 锛屾墍浠ュ湪DA杈逛笂锛庣瓟锛氬綋涔欑涓娆¤拷涓婄敳鏃讹紝搴旇鍦姝ｆ柟褰鐨凞A杈逛笂锛
绛旓細鐢茬涓娆¤拷涓婁箼,涓や汉绗竴娆＄浉閬,涓や汉鐨勮矾绋嬪樊鏄90*3=270绫 璁剧敤鏃堕棿X鍒,鍒欙紙72-65锛塜=270 X=270/7 鍒欑敳琛岃蛋鐨勬昏矾绋嬩负锛65*X=65*270/7=17550/7 涓鍏辫蛋浜90绫崇殑涓暟锛17550/7/90=195/7=27浣6 鎵浠ュ簲璇ヨ蛋鍒颁簡DA杈逛笂 濂逛滑鑵板湪姝ｆ柟褰鐨勯《鐐瑰鐩搁亣鐨勮瘽,鐢茶蛋鐨勬昏矾绋嬪簲璇ユ槸90*4鐨...
绛旓細鐢蹭箼涔嬮棿璺濈90m锛岄熷害宸负72/min-65/min=7/min,鎵浠ョ浉閬囨椂闂涓90/7 姝ゆ椂b璧颁簡72x90梅7=6480/7m, 鐩稿綋浜庤蛋浜6480/7梅90绾︾瓑浜10.3鏉¤竟 10.3梅4=2浣2.3鍗虫鏃禸璧颁簡2鍛ㄥ張2.3鏉¤竟 鍗砤銆乥鍦ˋD杈逛笂 鏁呯涓棰橀塂 锛2锛夌敱浜庨熷害宸7/min涓嶆槸90m鐨勭害鏁帮紝鏁呭畠浠笉鍙兘鍦姝ｆ柟褰椤剁偣...
绛旓細瑙ｏ細璁剧敳璧皒绫 涔欒蛋x+90绫 x+90 X ___ =___72 63 瑙ｅ緱 x=630 涔:630+90=720m 720梅90锛8 鈭村綋涔欑涓娆¤拷涓婄敳鏃跺湪AB涓 搴旇鏄繖鏍风殑 鑳藉姏鏈夐檺 鑳藉姏鏈夐檺鍟(^.^)
绛旓細BC杈逛笂
绛旓細璁剧粡杩嘪鍒嗛挓鍚庝箼杩戒笂浜嗙敳 57X-45X=90脳3 瑙ｅ緱X=22.5 鐒跺悗 姹傜敳璧扮殑璺▼ 45脳22.5=1012.5 1012.5梅360=2.8125 (3-2.8125)*90=16.875 鍗宠窛D鐐16.875 杩戒笂鐨
绛旓細D銆丏A杈逛笂 90/锛90-65锛夛紳3.6锛3鍒36绉掞級鐢插湪DA杈逛笂銆
