张大爷用篱笆围一块梯形菜地，一面靠墙（如图）。篱笆全长48米，如果每平方米收白菜9.5千克，这块地 如图张大爷用篱笆围一块梯形菜地菜地一面靠墙篱笆全长48玉米叶...
\u4e00\u5757\u6b63\u65b9\u5f62\u83dc\u5730\uff0c\u4e00\u9762\u9760\u5899\uff0c\u4e09\u9762\u7528\u7bf1\u7b06\u56f4\u8d77\u6765\uff0c\u7bf1\u7b06\u957f15\u7c73\uff0c\u8fd9\u5757\u6b63\u65b9\u5f62\u83dc\u5730\u7684\u8fb9\u957f\u662f\u591a\u5c11\u7c73\uff1f\u8fd9\u5757\u6b63\u65b9\u5f62\u83dc\u5730\u7684\u8fb9\u957f\u662f5\u7c73\u3002
\u89e3\u7b54\u8fc7\u7a0b\u5982\u4e0b\uff1a
\uff081\uff09\u4e00\u5757\u6b63\u65b9\u5f62\u83dc\u5730\uff0c\u4e00\u9762\u9760\u5899\uff0c\u4e09\u9762\u7528\u7bf1\u7b06\u56f4\u8d77\u6765\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a
\uff082\uff09\u7531\u56fe\u53ef\u5f97\uff0c\u5b9e\u9645\u4e0a\u7bf1\u7b06\u53ea\u6709\u6b63\u65b9\u5f62\u7684\u4e09\u6761\u8fb9\u957f\uff0c\u53c8\u56e0\u4e3a\u7bf1\u7b06\u7684\u957f\u5ea6\u662f15\u7c73\uff0c\u6240\u4ee5\u8fd9\u4e2a\u6b63\u65b9\u5f62\u7684\u8fb9\u957f=15/3=5\u7c73\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u6b63\u65b9\u5f62\u7684\u6027\u8d28\uff1a
\uff081\uff09\u4e24\u7ec4\u5bf9\u8fb9\u5206\u522b\u5e73\u884c\uff1b\u56db\u6761\u8fb9\u90fd\u76f8\u7b49\uff1b\u90bb\u8fb9\u4e92\u76f8\u5782\u76f4\u3002
\uff082\uff09\u56db\u4e2a\u89d2\u90fd\u662f90\u00b0\uff0c\u5185\u89d2\u548c\u4e3a360\u00b0\u3002
\uff083\uff09\u5bf9\u89d2\u7ebf\u4e92\u76f8\u5782\u76f4\uff1b\u5bf9\u89d2\u7ebf\u76f8\u7b49\u4e14\u4e92\u76f8\u5e73\u5206\uff1b\u6bcf\u6761\u5bf9\u89d2\u7ebf\u5e73\u5206\u4e00\u7ec4\u5bf9\u89d2\u3002
\uff084\uff09\u65e2\u662f\u4e2d\u5fc3\u5bf9\u79f0\u56fe\u5f62\uff0c\u53c8\u662f\u8f74\u5bf9\u79f0\u56fe\u5f62\uff08\u6709\u56db\u6761\u5bf9\u79f0\u8f74\uff09\u3002
\u5468\u957f\u7684\u516c\u5f0f\uff1a
\uff081\uff09\u5706\uff1aC=\u03c0d=2\u03c0r (d\u4e3a\u76f4\u5f84\uff0cr\u4e3a\u534a\u5f84\uff0c\u03c0)
\uff082\uff09\u4e09\u89d2\u5f62\u7684\u5468\u957fC = a+b+c(abc\u4e3a\u4e09\u89d2\u5f62\u7684\u4e09\u6761\u8fb9)
\uff083\uff09\u56db\u8fb9\u5f62\uff1aC=a+b+c+d\uff08abcd\u4e3a\u56db\u8fb9\u5f62\u7684\u8fb9\u957f\uff09\u3000\u3000
\uff084\uff09\u7279\u522b\u7684\uff1a\u957f\u65b9\u5f62\uff1aC=2(a+b) \uff08a\u4e3a\u957f\uff0cb\u4e3a\u5bbd\uff09
\uff085\uff09\u6b63\u65b9\u5f62\uff1aC=4a\uff08a\u4e3a\u6b63\u65b9\u5f62\u7684\u8fb9\u957f\uff09
\uff086\uff09\u591a\u8fb9\u5f62\uff1aC=\u6240\u6709\u8fb9\u957f\u4e4b\u548c\u3002
\uff0839-15\uff09\u00d715\u00f72\u00d79.5\uff0c
=24\u00d715\u00f72\u00d79.5\uff0c
=180\u00d79.5\uff0c
=1710\uff08\u5343\u514b\uff09\uff1b
\u7b54\uff1a\u8fd9\u5757\u5730\u4e00\u5171\u53ef\u4ee5\u6536\u767d\u83dc1710\u5343\u514b\uff0e
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绛旓細璁惧涓篨,闀夸负48-2X 闈㈢Н涓篩 Y=(48-2X)X =-2X^2+48X 褰揦=12鏃 48-2*12=24 Y鏈澶=24*12 =288 9.5*288=2736(鍗冨厠)
绛旓細48-15=33绫 33*15/2*9.5=2351.25鍗冨厠 绛旓細杩欏潡鍦颁竴鍏卞彲浠ユ敹鐧借彍2351.25鍗冨厠
绛旓細鍒嗘瀽锛绡辩瑔鐨闀垮害宸茬煡锛岃彍鍦扮殑楂樺凡鐭ワ紝浜庢槸鍙互姹傚嚭鑿滃湴鐨勪笂搴曚笌涓嬪簳鐨勫拰锛岃繘鑰鍒╃敤姊舰鐨闈㈢Н鍏紡鍗冲彲姹傚嚭鑿滃湴鐨勯潰绉锛岀敤鑿滃湴鐨闈㈢Н涔樻瘡骞虫柟绫崇櫧鑿滅殑浜ч噺锛屽嵆鍙眰鍑虹櫧鑿滅殑鎬讳骇閲忥紟瑙ｇ瓟锛 瑙ｏ細锛39-15锛壝15梅2脳9.5锛=24脳15梅2脳9.5锛...
绛旓細姹傝繖鍧楀湴鐨勯潰绉細锛49-15锛壝15梅2锛=34脳15梅2锛=255锛堝钩鏂圭背锛夛紱姹傛讳骇閲忥細10脳255=2550锛堝崈鍏嬶級锛涚瓟锛氳繖鍧楀湴涓鍏卞彲浠ユ敹鐧借彍2550鍗冨厠锛
绛旓細瑙ｏ細鍥犱负涓鍧楁褰㈣彍鍦颁竴闈㈤潬澧欙紝涓绡辩瑔鍏ㄩ暱48绫筹紝鎵浠ユ褰㈢殑涓夎竟闀垮拰涓48绫炽傚張鍛ㄩ暱鐩哥瓑鐨勫洓杈瑰舰锛屾鏂瑰舰闈㈢Н鏈澶э紝鎵浠ユ墍鍥鎴愮殑姊舰瑕佽兘鍙樻崲鎴愭鏂瑰舰锛屽嵆姝ｆ柟褰笁杈瑰拰涓48绫筹紝姝ｆ柟褰㈣竟闀16绫炽傚皢姊舰闂杞寲涓烘鏂瑰舰闂锛氭鏂瑰舰闈㈢Н锛堝嵆姊舰闈㈢Н鏈澶у硷級涓16*16=256锛屽張姣忓钩鏂圭背鏀剁櫧鑿9.5...
绛旓細涓闈㈤潬澧欏叏闀48绫鐨勭绗嗭紝鏈澶у彲鍥鎴12x24骞虫柟绫崇殑鑿滃湴銆傛墍浠ヨ繖鍧楀湴鏈澶у彲浠ユ敹鐧借彍12x24x10=2880鍗冨厠銆
绛旓細鐢变簬姝ょ洿瑙姊舰涓闈㈤潬澧欐墍浠绡辩瑔鍏ㄩ暱鐢变笂搴曪紝涓嬪簳锛岄珮鏋勬垚锛屼篃灏辨槸涓婂簳+涓嬪簳+楂=48锛屽叾涓珮=12锛屾墍浠ヤ笂搴+涓嬪簳=48-12=36锛岀洿瑙掓褰㈤潰绉=1/2脳楂樏楋紙涓婂簳+涓嬪簳锛=1/2脳12脳36=216骞虫柟绫筹紝鍥犱负姣忓钩鏂圭背鏀剁櫧鑿9.5鍗冨厠锛屾墍浠ヨ繖鍧楀湴涓鍏辫兘澶熸敹216脳9.5=2007鍗冨厠 ...
绛旓細绡辩瑔鍏ㄩ暱47绫,姊舰楂15绫,鍒欎笂涓嬪簳鐨勫拰鏄47-15=32绫.姊舰闈㈢Н = (涓婂簳+涓嬪簳)脳楂樏2 = 32脳15梅2 = 240骞虫柟绫.
绛旓細48-15=33绫33X15闄2=247.5骞虫柟绫9.5X247.5=2351.25Kg 鍥犱负姊舰鐨鍏紡鏄紙涓婂簳鍔犱笅搴)涔橀珮闄2鎵浠48-15鏄笂搴曞拰涓嬪簳鐨勫拰鍐嶄箻鍗佷簲灏辨槸姊舰鐨勯潰绉簡
绛旓細姹備笂搴4锛 3 4 5缁勬垚涓鐩磋涓夎褰傝4涓婂簳涓篨 鏍规嵁鍕捐偂瀹氱悊涓ょ洿瑙掕竟鐨勫钩鏂瑰拰绛変簬鏂滆竟鐨勫钩鏂 鍒楀紡锛 15骞虫柟+X骞虫柟=锛48-15锛夊钩鏂 绠楀嚭X=13鍙1/11 姹姊舰闈㈢Н锛 锛堜笂搴+涓嬪簳锛*楂/2=锛13鍙1/11+15锛*15/2=210鍙15/22 姹備骇閲忥細 210鍙15/22*10=锛堣嚜宸辩畻锛...
