某小区靠墙用篱笆围出一个三角形的花圃，篱笆总长是15米，这块花圃占地多少平方米？ 林阿姨靠墙用篱笆围一个长方形的花圃花圃长18米宽12米篱笆有...
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12x2+18=42
12x18=216
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绛旓細绡辩瑔鐨勬婚暱=涓夎褰搴+涓夎褰㈤珮锛屾墍浠ワ紝搴+9=15锛屽簳=6绫筹紝闈㈢Н=6*9/2=27骞虫柟绫
绛旓細15梅3=5 5脳5梅2=12.5
绛旓細锛堜簲锛夆埖涓ゆ潯鐩磋杈规墍鐢ㄧ殑绡辩瑔涔嬪拰鎭板ソ涓轰簲7绫筹紝鍥存垚鐨勮姳鍧涙槸濡傚浘鎵绀虹殑鐩磋鈻矨BC锛屽叾涓垹ACB=浜嗗緱掳锛孉C杈圭殑闀夸负x绫筹紝鈭碆C=浜7-x锛屸埖鐩磋鈻矨BC鐨勯潰绉负S骞虫柟绫筹紝鈭碨=浜斾粬AC?BC=浜斾粬x锛堜簲7-x锛=-浜斾粬x浠+浜7浠杧锛涳紙浠栵級褰揝=3寰楁椂锛-浜斾粬x浠+浜7浠杧=3寰楋紝鏁寸悊寰楋紝x浠-浜7x...
绛旓細4.8+3.6=8.4锛堢背锛夆︹绡辩瑔闀 8.4梅锛4-1锛=2.8锛堢背锛夆︹︽鏂瑰舰杈归暱 2.8*2.8=7.84锛堝钩鏂圭背锛夆︹﹂潰绉
绛旓細=300梅12 =25锛堢背锛夌瓟锛氳嚦灏戦渶瑕25绫抽暱鐨绡辩瑔銆傘愯В鏋愩戞湰棰樹富瑕佽冩煡涓夎褰鐨勯潰绉叕寮忕殑杩愮敤銆傚厛姹傚嚭鐩磋涓夎褰㈢殑闈㈢Н=搴晉楂樏2=15x20梅2=150骞虫柟鍘樼背銆傛眰绡辩瑔鐨勯暱搴︼紝灏辨槸姹傝繖涓洿瑙掍笁瑙掑舰鐨勬枩杈圭殑闀垮害锛屾牴鎹笁瑙掑舰鐨勫簳=涓夎褰㈢殑闈㈢Нx2梅楂樺緱鍒帮細150x2梅12=25绫筹紝鐢辨鍥炵瓟姝ら棶棰樺嵆鍙
绛旓細=300梅12 =25锛堢背锛夌瓟锛氳嚦灏戦渶瑕25绫抽暱鐨绡辩瑔銆傘愯В鏋愩戞湰棰樹富瑕佽冩煡涓夎褰鐨勯潰绉叕寮忕殑杩愮敤銆傚厛姹傚嚭鐩磋涓夎褰㈢殑闈㈢Н=搴晉楂樏2=15x20梅2=150骞虫柟鍘樼背銆傛眰绡辩瑔鐨勯暱搴︼紝灏辨槸姹傝繖涓洿瑙掍笁瑙掑舰鐨勬枩杈圭殑闀垮害锛屾牴鎹笁瑙掑舰鐨勫簳=涓夎褰㈢殑闈㈢Нx2梅楂樺緱鍒帮細150x2梅12=25绫筹紝鐢辨鍥炵瓟姝ら棶棰樺嵆鍙
绛旓細鐢40绫崇殑绡辩瑔涓杈闈犲鍥村煄涓涓笁瑙掑舰鑿滃湴,闈㈢Н鏈澶ф槸澶氬皯锛熷洿鎴愭涓夎褰㈤潰绉渶澶с傛涓夎褰㈣竟闀40梅2=20锛堢背锛夋涓夎褰㈤珮20脳1/2鈭3=10鈭3锛堢背锛夋涓夎褰㈤潰绉20脳10鈭3脳1/2=100鈭3锛堝钩鏂圭背锛
绛旓細绛夎竟涓夎褰锛屼竴闈㈡湁澧欙紝閭ｄ箞灏卞彧鏈変袱闈㈡槸鐢ㄧ绗嗗洿鎴愶紝杩欐牱姣忎竴闈㈢殑绡辩瑔澧闀匡細24梅2=12锛堢背锛夛紝鍥犱负鏄瓑杈逛笁瑙掑舰锛屾墍浠ヨ澧欐湁12绫炽傚垪寮忥細24梅2=12绫炽
绛旓細绡辩瑔闀匡細18脳3=54绫
绛旓細娌℃湁浠涔堟潯浠堕檺鍒剁殑璇濓紝閭ｄ箞瀹冩墍鐢ㄧ殑绡辩瑔闀垮害鍙互浠绘剰闀垮氨鑳藉缓澶уぇ灏忓皬涓嶄竴鐨勫悇绉嶇洿瑙涓夎褰銆傚ぇ鐨勮兘浠绘剰澶э紝灏忕殑鍙换鎰忓皬銆傚洜姝わ紝闀垮害娌鏈変竴涓瀹氭暟銆
