一个用塑料薄膜覆盖的蔬菜大棚，长20米，横截面是一个半径是2米的半圆。 一个塑料薄膜覆盖的蔬菜大棚（如图），长20米，横截面是一个半...
\u4e00\u4e2a\u7528\u5851\u6599\u8584\u819c\u8986\u76d6\u7684\u852c\u83dc\u5927\u68da\uff0c\u957f20\u7c73\uff0c\u6a2a\u622a\u9762\u662f\u4e00\u4e2a\u534a\u5f842\u7c73\u7684\u534a\u5706\uff0e\uff081\uff09\u642d\u5efa\u8fd9\u4e2a\u5927\u68da\u5927\u7ea6\u9700\u8981\u591a\u5c11\u5e73\u65b9\uff081\uff09[2\u00d72\u00d73.14\u00d720+3.14\u00d72 2 \u00d72]\u00f72\uff0c=[251.2+25.12]\u00f72\uff0c=276.32\u00f72\uff0c=138.16\u2248138\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u642d\u5efa\u8fd9\u4e2a\u5927\u68da\u5927\u7ea6\u8981\u7528138\u5e73\u65b9\u7c73\u7684\u5851\u6599\u8584\u819c\uff0e\uff082\uff093.14\u00d72 2 \u00d720\u00f72\uff0c=251.2\u00f72\uff0c=125.6\u2248126\uff08\u7acb\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u5927\u68da\u5185\u7684\u7a7a\u95f4\u5927\u7ea6\u662f126\u7acb\u65b9\u7c73\uff0e
\uff081\uff092\u00d72\u00d720=80\uff08\u5e73\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u8fd9\u4e2a\u5927\u68da\u7684\u79cd\u690d\u9762\u79ef\u662f80\u5e73\u65b9\u7c73\uff0e\uff082\uff093.14\u00d722\u00f72\u00d720\uff1b=3.14\u00d7\uff084\u00f72\u00d720\uff09=3.14\u00d740=125.6\uff08\u7acb\u65b9\u7c73\uff09\uff1b\u7b54\uff1a\u5927\u68da\u5185\u7684\u7a7a\u95f4\u5927\u7ea6\u6709125.6\u7acb\u65b9\u7c73\uff0e
大棚顶面面积：3.14×（2×2）×20×1/2=125.6m²大棚一端面积：3.14×2²×1/2=6.28m²
塑料布：125.6+6.28×2=788.768m²
大棚空间：3.14×2²×20×1/2=125.6m³
绛旓細闇瑕濉戞枡钖勮啘鐨闈㈢Н锛2脳3.14脳2脳15梅2+3.14脳2 2 锛12.56脳15梅2+3.14脳4锛=94.2+12.56锛=106.76锛堝钩鏂圭背锛夛紱澶ф鍐呯殑绌洪棿锛3.14脳2 2 脳15梅2锛=3.14脳4脳15梅2锛=188.4梅2锛=94.2锛堢珛鏂圭背锛夛紱绛旓細鎼缓杩欎釜澶ф瑕佺敤106.76骞虫柟绫崇殑濉戞枡钖勮啘锛屽ぇ妫鍐呯殑绌洪棿澶х害鏈94.2绔嬫柟...
绛旓細锛1锛塠2脳2脳3.14脳20+3.14脳2 2 脳2]梅2锛=[251.2+25.12]梅2锛=276.32梅2锛=138.16鈮138锛堝钩鏂圭背锛夛紱绛旓細鎼缓杩欎釜澶ф澶х害瑕佺敤138骞虫柟绫崇殑濉戞枡钖勮啘锛庯紙2锛3.14脳2 2 脳20梅2锛=251.2梅2锛=125.6鈮126锛堢珛鏂圭背锛夛紱绛旓細澶ф鍐呯殑绌洪棿澶х害鏄126绔嬫柟绫筹紟...
绛旓細鈶.12.56+94.2=106.76(骞虫柟绫)绛:瑕嗙洊鍦ㄨ繖涓澶ф涓婄殑濉戞枡钖勮啘绾︽湁106.76骞虫柟绫炽(2).3.14脳2^2脳15梅2 =3.14脳4脳15梅2 =12.56脳15梅2 =188.4梅2 =94.2(绔嬫柟绫)绛:澶ф鍐呯殑绌洪棿澶х害鏈94.2绔嬫柟绫炽傚弬鑰冭祫鏂欙細鍦ㄨ涓婅佸笀鍙垜浠仛鐨.....
绛旓細缁撴灉鏄94.2绔嬫柟绫
绛旓細3x3x3.14+3x3.14x15 =9x3.14+45x3.14 =54x3.14 =169.56锛堝钩鏂圭背锛3x3x3.14x15梅2=211.95锛堢珛鏂圭背锛夌瓟锛钖勮啘鏄169.56骞虫柟绫筹紝绌洪棿鏄211.95绔嬫柟绫
绛旓細妯埅闈㈢殑闈㈢Н涓猴細2脳2脳3.14梅2=6.28骞虫柟绫 鎷辩殑闀垮害2脳2脳3.14梅2=6.28绫 鎷辨鐨勯潰绉负锛6.28脳20=125.6骞虫柟绫 濉戞枡钖勮啘鎬婚潰绉负锛125.6+6.28脳2=138.16骞虫柟绫炽傚疄闄呯敤閲忓ぇ浜庤繖涓暟锛屽洜涓鸿鍘嬭竟鎺ョ紳銆傝彍鍦伴潰绉細2脳2脳20=80骞虫柟绫 澶ф鍐呯┖闂达細6.28脳20=125.6绔嬫柟绫 ...
绛旓細绌洪棿=2X2X3.14梅2X15=6.28X15=94.2绔嬫柟绫
绛旓細澶ф鐨勫彲浠ョ湅鎴愭槸鍗婁釜搴曢潰鍗婂緞鏄2绫炽侀珮鏄15绫崇殑鍦嗘煴 琛ㄩ潰绉=蟺脳2²+蟺脳2脳15=34蟺=106.76骞虫柟绫 瀹圭Н=蟺脳2²脳15梅2=30蟺=94.2绔嬫柟绫 绛旓細澶ф闇瑕106.76骞虫柟绫崇殑濉戞枡钖勮啘锛屽ぇ妫鍐呯殑绌洪棿澶х害鏈94.2绔嬫柟绫
绛旓細瑙ｏ細s=15*2*2=60骞虫柟绫
绛旓細鍙互鎶婅繖涓钄彍澶ф鐪嬩綔鏄涓涓鍦嗘煴锛岀敤鍦嗘煴琛ㄩ潰绉叕寮忚绠楀啀闄や簬2 鍥犱负2鐨勫钩鏂逛笉鑳借〃绀哄嚭鏉ユ墍浠2鐨勫钩鏂瑰啓鎴:鈥(2鐨勫钩鏂)4鈥濓紙2鐨勫钩鏂=2脳2=4)2脳3.14脳2 =6.28脳2 =12.56锛堢背锛12.56脳15=188.4锛堝钩鏂圭背锛3.14脳锛2鐨勫钩鏂癸級4脳2 =12.56脳2 =25.12锛堝钩鏂圭背锛188.4+25.12=213...
