有一根电线杆的影子长5.4米，一根竹竿长2米影子是1.8米，电线杆实际几米？
\u5982\u4e0b\u56fe\u6240\u793a \u540c\u4e00\u65f6\u523b\u76f4\u7acb\u5728\u5730\u4e0a3\u7c73\u957f\u7684\u7af9\u7aff\u7684\u5f71\u957f\u662f1.8\u7c73\uff0c\u9644\u8fd1\u6709\u4e00\u6839\u7535\u7ebf\u6746\u7684\u5f71\u5b50\u957f\u662f5.4\u7c73\uff0c\u6c42\u7535\u7ebf\u6746\u9ad8\u89e3\uff1a\u7531\u9898\u53ef\u5f97\uff0c\u7af9\u7aff\u957f\uff1a\u7af9\u7aff\u5f71\u957f=\u7535\u7ebf\u6746\u9ad8\uff1a\u7535\u7ebf\u6746\u5f71\u957f
\u52193:1.8=\u7535\u7ebf\u6746\u9ad8\uff1a5.4
1.8\u00d7\u7535\u7ebf\u6746\u9ad8=3\u00d75.4
\u7535\u7ebf\u6746\u9ad8=9\uff08\u7c73\uff09
5.4\u00f71.8\u00d72=6\u7c73
2/1.8*5.4=6米6米
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绛旓細鐢电嚎鏉嗕竴绫崇殑褰遍暱搴︽槸1.8闄や互2绛変簬0.9绫,绗涓鏍圭數绾挎潌鐨楂樺害鏄5.4闄や互0.9绛変簬6绫,鏈変竴绫冲煁鍦ㄥ湴涓嬪氨鏄6+1=7绫 寰楀嚭鎬婚暱搴︽槸7绫 杩欐槸鎴戠殑姣曚笟鑰冭瘯棰樺憖,濂界啛鎮
绛旓細5.4绫 濡傚浘,AB(鐢电嚎鏉闀X);璁綝E(灏忔槑鏈鍚庣鐢鏉嗚繕鏈鐨勮窛绂讳负y).tan鈭爉=1.8/3=x/(y+4+3)tan鈭爊=1.8/1=x/(y+1)寰楀嚭灏忔槑绂鐢电嚎鏉嗙殑璺濈:y=2绫 鐢电嚎鏉嗙殑闀垮害涓:x=5.4绫
绛旓細妤间笂涓や綅鐨勭患鍚堝惂 璁鐢电嚎鏉楂樺害涓篨锛屽缓绔嬩袱涓笁瑙掑舰锛屽鍥 瀹為檯闀垮害鍚褰卞瓙闀垮害姣斿肩浉绛 X/5.6=3/2.1 鍙眰寰梄=8
绛旓細4.5
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绛旓細璁鐢电嚎鏉闀垮害涓篨 m锛 閭ｄ箞 灏忎附鐨勮韩楂樹笌鐢电嚎鏉嗛暱搴︿箣姣斿氨绛変簬浜岃呭奖闀夸箣姣 寰楃瓑寮忥細1.6/X=1/5 瑙ｅ緱锛歑= 8m
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绛旓細棣栧厛,褰卞瓙闀涓庣墿浣撻暱鏄垚姣斾緥鐨勶紱鎵浠ュ凹璁鏉嗛暱x淇濋櫓璧疯缁熶竴鍗曚綅 x:6=180:150 150x=6*180=1080 x=7.2cm 鎵浠ュ凹璁炬潌闀7.2cm
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