小华测量电线杆的高度他量得电线杆在平地上的影长5.6m同时把一把米尺立在电线杆的位置量得影长80m
\u5c0f\u534e\u6d4b\u91cf\u7535\u7ebf\u6746\u7684\u9ad8\uff0c\u91cf\u5f97\u7535\u7ebf\u6746\u5728\u5e73\u5730\u4e0a\u7684\u5f71\u5b50\u957f\u4e3a\u3011\u89e3\uff1a\u7269\u4e0e\u5f71\u7684\u6bd4\u4e3a2\uff1a1.8
\u8bbe\u7535\u7ebf\u6746\u4e3ax\u7c73
x\uff1a5.4=2\uff1a1.8
1.8 x=5.4\u00d72
x=6
\uff08\u5c31\u8fd9\u6837\u4e86~~\uff09
\u697c\u4e0a\u4e24\u4f4d\u7684\u7efc\u5408\u5427
\u8bbe\u7535\u7ebf\u6746\u9ad8\u5ea6\u4e3aX\uff0c\u5efa\u7acb\u4e24\u4e2a\u4e09\u89d2\u5f62\uff0c\u5982\u56fe
\u5b9e\u9645\u957f\u5ea6\u540c\u5f71\u5b50\u957f\u5ea6\u6bd4\u503c\u76f8\u7b49
X/5.6=3/2.1
\u53ef\u6c42\u5f97X=8
绛旓細杩嘍浣淒E鍨傜洿浜庡湴闈 鍥犱负CD涓庡湴闈㈡垚30掳瑙掞紝涓擟D=4绫 鎵浠E=2绫筹紝CE=4鈭3绫 鍙堝洜涓1绫鏉嗙殑褰卞瓙闀夸负2绫 鎵浠F=4绫 鎵浠鐢电嚎鏉AB鐨勫奖瀛愰暱涓築C+CE+EF=14+4鈭3绫 鍒橝B=7+2鈭3绫
绛旓細鏍规嵁鍚屼竴鏃跺埢鐗╅珮涓庡奖闀挎垚姣斾緥锛屽緱10梅2=5锛涘湪Rt鈻矯DE涓紝鏍规嵁30掳鎵瀵圭殑鐩磋杈规槸鏂滆竟鐨勪竴鍗婏紝寰桪E=2锛庡啀鏍规嵁鍕捐偂瀹氱悊锛屽緱CE=2 锛涘洜涓篋E鈯C锛屽垯DE瀵瑰簲鐨勬棗鏉嗛珮搴鍜孌E鐩哥瓑锛孋E瀵瑰簲鐨勬棗鏉嗛珮搴﹀悓鏍锋牴鎹細鍚屼竴鏃跺埢鐗╅珮涓庡奖闀挎垚姣斾緥锛屾槸2 梅2= 锛庢晠鏃鏉嗙殑楂樺害鏄5+2+ 鈮8.7锛
绛旓細鏍规嵁鍚屼竴鏃跺埢鐗╅珮涓庡奖闀挎垚姣斾緥锛屽緱10梅2=5锛涘湪Rt鈻矯DE涓紝鏍规嵁30掳鎵瀵圭殑鐩磋杈规槸鏂滆竟鐨勪竴鍗婏紝寰桪E=2锛庡啀鏍规嵁鍕捐偂瀹氱悊锛屽緱CE=23锛涘洜涓篋E鈯C锛屽垯DE瀵瑰簲鐨勭數绾挎潌楂樺害鍜孌E鐩哥瓑锛孋E瀵瑰簲鐨勭數绾挎潌楂樺害鍚屾牱鏍规嵁锛氬悓涓鏃跺埢鐗╅珮涓庡奖闀挎垚姣斾緥锛屾槸23梅2=3锛庢晠鐢电嚎鏉嗙殑楂樺害鏄5+2+3鈮8.7锛
绛旓細鐢遍鎰忓緱锛欰B/BE=1/2锛孌F/FE=1/2锛屽嵆褰遍暱鏄墿闀跨殑2鍊嶃傚洜涓鸿DCF=30搴︼紝鎵浠F=CD/2=2m锛屽垯FE=2DF=4m 鍦ㄧ洿瑙掍笁瑙掑舰DCF涓繍鐢ㄦ瘯杈惧摜鎷夋柉瀹氱悊锛屾湁锛欳F^2=CD^2-DF^2 鍒機F=2鈭3m 鎵浠ワ細BE=BC+CF+FE=10m+2鈭3m+4m=14+2鈭3m AB=BE/2=7+鈭3m鈮8.732m ...
绛旓細鍦ㄤ腑Rt鈻矪DE锛屸埓BE=DE?tan伪锛=AC?tan伪锛=20脳tan22掳锛屸増8.08绫筹紝鈭碅B=AE+EB=AE+CD=8.08+1.20鈮9.3锛堢背锛夛紟绛旓細鐢电嚎鏉嗙殑楂樺害绾︿负9.3绫筹紟
绛旓細15.1 瑙ｏ細鍦 涓紝 鈥︹︹3鍒 鈥︹︹4鍒 = 鈥︹︹5鍒 (绫)鈥︹︹6鍒 = = 鈥︹︹
绛旓細锛堝埄鐢ㄤ笁瑙掑舰鐩镐技锛夎鐢电嚎鏉嗙殑楂樺害鏄痻绫炽倄:2=5.4:1.5瑙ｅ緱x=7.2
绛旓細瑙ｏ細鐢遍鎰忓緱锛欰B/BE=1/2锛孌F/FE=1/2锛屽嵆褰遍暱鏄墿闀跨殑2鍊嶃傚洜涓鸿DCF=30搴︼紝鎵浠F=CD/2=2m锛屽垯FE=2DF=4m CF^2=CD^2-DF^2 鍒機F=2鈭3m 鎵浠ワ細BE=BC+CF+FE=10m+2鈭3m+4m=14+2鈭3m AB=BE/2=7+鈭3m鈮8.732m
绛旓細鍥炵瓟锛6梅2x3+2=11
绛旓細濡傚浘鎵绀猴紝寤堕暱AD锛孊C浜や簬E锛岃繃D鐐逛綔BE鍨傜嚎浜E浜嶧锛屽湪鐩磋鈯緾DF涓紝鈭燚CF=30掳锛屾枩杈笴D=4m锛屽垯 CF=2鈭3m锛孌F=2m 鍦ㄢ娍DFE浜庘娍ABE鐩镐技锛岄兘绗﹀悎娴嬪緱1绫鏉嗙殑褰遍暱涓2绫筹紝鍒欙紝DF鐨勫奖闀縀F=4m 鏁翠釜鏉咥B鐨勫奖闀夸负BE=BC+CF+FE=10+2鈭3+4=14+2鈭3 鑰屾潌AB涓築E涓鍗婏紝AB=7+鈭3 ...
