如图，已知长方形ABCD的面积为36㎝²，三角形ABE的面积是6㎝²，三角形AFD的面积是9㎝² 如图，已知长方形ABCD的面积是24平方厘米，三角形ABE的...
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\u8fde\u63a5\u957f\u65b9\u5f62\u5bf9\u89d2\u7ebfAC\uff0c\u5982\u4e0b\u56fe\uff1a \u53ef\u77e5S\u25b3ABC=S\u25b3ACD=12\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0c\u56e0\u4e3aS\u25b3AFD=6\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0c\u6240\u4ee5S\u25b3ACF=6\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0c\u7531\u6b64\u53ef\u77e5F\u662fDC\u8fb9\u7684\u4e2d\u70b9\uff0c\u56e0\u4e3aS\u25b3ABE=5\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0c\u6240\u4ee5S\u25b3AEC=7\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0c\u7531\u6b64\u53ef\u77e5BE\uff1aEC=5\uff1a7\uff0cS\u25b3EFC= 1 2 \u00d7CF\u00d7CE=3.5\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff0cS\u25b3AEF=S\u957f-S\u25b3ABE-S\u25b3ADF-S\u25b3CEF\uff0c=24-5-6-3.5\uff0c=9.5\uff08\u5e73\u65b9\u5398\u7c73\uff09\uff1b\u6545\u7b54\u6848\u4e3a\uff1a9.5\uff0e
面积是 1515
15
5√10
绛旓細鈭碨鈻矨BE =(1/2)脳AB脳BE=(1/2)脳10=5 鈭碨鈻矨EF=S闀-S鈻矨BE-S鈻矨DF-S鈻矯EF=24-5-6-3.5=9.5 绛:S鈻矨EF=9.5(cm^2)
绛旓細涓夎褰DC涓紝鐢变簬E銆丗涓轰腑鐐硅繛绾匡紝鐢辨墍璋撯滀腑鐐逛笁瑙掑舰鈥濅笌鍘熶笁瑙掑舰涔嬮棿鐨勫叧绯荤煡閬擄紝鈻矱DF鐨勯潰绉涓衡柍ADC鐨勯潰绉殑1/4锛屼篃灏辨槸璇达紝鍥句腑闃村奖閮ㄥ垎涓衡柍ADC鐨3/4锛闀挎柟褰鎬婚潰绉负88骞虫柟鍘樼背锛屽瑙掔嚎灏嗛潰绉垎涓轰袱鐩哥瓑閮ㄥ垎锛屽嵆鈻矨DC闈㈢Н涓88/2=44骞虫柟鍘樼背锛岄槾褰遍儴鍒嗗嵆姊舰AEFC闈㈢Н涓44*3/4=33骞虫柟鍘樼背...
绛旓細濡傚浘,宸茬煡闀挎柟褰bcd鐨勯潰绉涓36骞虫柟鍘樼背,E銆丳鍒嗗埆涓篈D,CE鐨勪笁鍒嗕箣涓鍒嗙偣,涓夎褰PB鐨 濡傚浘,宸茬煡闀挎柟褰bcd鐨勯潰绉负36骞虫柟鍘樼背,E銆丳鍒嗗埆涓篈D,CE鐨勪笁鍒嗕箣涓鍒嗙偣,涓夎褰PB鐨勯潰绉负澶氬皯骞虫柟鍘樼背?... 濡傚浘,宸茬煡闀挎柟褰bcd鐨勯潰绉负36骞虫柟鍘樼背,E銆丳鍒嗗埆涓篈D,CE鐨勪笁鍒嗕箣涓鍒嗙偣,涓夎褰PB鐨勯潰绉负澶氬皯骞虫柟...
绛旓細鎵浠ワ紝S锛圗BFG锛=S1+S2=15+50=65锛堝钩鏂瑰帢绫筹級銆
绛旓細瑙ｏ細鍥涜竟褰GFH鐨闈㈢Н鏄紙A銆佺瓑浜6骞虫柟鍘樼背 锛夌悊鐢卞涓嬶細杩炵粨EF锛屽垯EF//AB鍜孋D锛屸柍EFG涓庣煩褰BFE鍚屽簳绛夐珮锛岄潰绉负鐭╁舰ABFE鐨勪竴鍗婏紝鍚岀悊鍙煡锛氣柍EFH闈㈢Н涓虹煩褰FCD闈㈢Н鐨勪竴鍗婏紝鎵浠ュ洓杈瑰舰EGFH鏄暱鏂瑰舰ABCD鐨勯潰绉殑涓鍗娿
绛旓細濡傚浘锛屽凡鐭ラ暱鏂瑰舰ABCD 鐨勯潰绉鏄236cm锛孍,P鍒嗗埆 涓篈D锛孋E鐨勪笁鍒嗕箣涓鍒嗙偣锛岄槾褰遍儴鍒嗛潰绉负锛烻闃=36-锛6+12+6+4锛=8锛堝钩鏂瑰帢绫筹級
绛旓細2 脳 2 1+2 - 1 2 脳 1 1+2 锛=72脳锛1- 1 4 - 1 6 - 1 6 锛=72脳 5 12 =30锛堝钩鏂瑰帢绫筹級锛涚瓟锛氫笁瑙掑舰AEF鐨勯潰绉鏄30骞虫柟鍘樼背锛庢晠绛旀涓猴細30锛
绛旓細10梅4脳16 =2.5脳16 =40
绛旓細瑙ｏ細寤堕暱DC銆丄F浜や簬鐐笻锛屽洜涓ABCD鏄闀挎柟褰紝鎵浠B鈭H锛屾墍浠モ柍HCF鈭解柍ABF锛屸柍AEG鈭解柍HDG锛屽嵆 HC/AB =CF/BF 锛孉E/DH =EG/GD 锛屽洜涓築E=3AE锛孊F=2FC锛屾墍浠E=1/4AB锛孋H=1/2 AB锛屽嵆AE锛欴H=1锛6锛屾墍浠G锛欸D=1锛6锛屽洜涓衡柍AED鐨勯潰绉=1/4AE脳AD梅2锛屽洜涓闀挎柟褰㈢殑闈㈢Н鏄120骞虫柟...
绛旓細750-1200梅2=750-600=150骞虫柟鍘樼背
