求下面阴影部分的面积.(单位:厘米)
\u6c42\u4e0b\u9762\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef\u3002\uff08\u5355\u4f4d\uff1a\u5398\u7c73\uff09\u4f60\u628a\u9634\u5f71\u90e8\u5206\u5168\u79fb\u52a8\u5230\u4e00\u8fb9\uff0c\u5c31\u53ef\u4ee5\u770b\u51fa\u9634\u5f71\u90e8\u5206\u5360\u4e861/4\uff0c\u6240\u4ee5\u9634\u5f71\u9762\u79ef\u662f5\u00d75\u00f74=6.25\u5e73\u65b9\u5398\u7c73
\u4f60\u8fd9\u7c7b\u6c42\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef\u5173\u952e\u662f\u8981\u4f1a\u628a\u7ed9\u7684\u56fe\u5f62\u62c6\u89e3\u5f00\u6765\u770b\uff0c\u65b9\u6cd5\u4f1a\u6709\u5f88\u591a\u79cd\uff0c\u4e00\u822c\u6211\u4eec\u7528\u5176\u4e2d\u4e00\u4e2a\u76f8\u5bf9\u7b80\u6d01\u7684\u65b9\u6cd5\u6765\u89e3\u7b54\u3002
\u8fd9\u9898\u5e94\u8be5\u8981\u8bf4\u660e\u90a3\u662f\u4e00\u4e2a\u6b63\u65b9\u5f62\u5427\uff01
\u8fd9\u4e2a\u9634\u5f71\u90e8\u5206\u6211\u4eec\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u5927\u4e09\u89d2\u5f62\uff08\u4e0b\u9762\u7684\u5e95\u662f8+6\uff09\u5c11\u4e86\u4e00\u4e2a\u6b63\u65b9\u5f62\u51cf\u6389\u4e00\u4e2a\u56db\u5206\u4e4b\u4e00\u5706\u3002
\u5927\u4e09\u89d2\u5f62\u7684\u9762\u79ef\uff1a\uff088+6\uff09\u00d78\u00f72
\u5de6\u4e0b\u89d2\u7684\u9762\u79ef\u4e3a\u6b63\u65b9\u5f62\u7684\u9762\u79ef\u51cf\u56db\u5206\u4e4b\u4e00\u5706\uff1a8\u00d78\u20143.14\u00d78\u00d78\u00f74
\u9634\u5f71\u90e8\u5206\u7684\u9762\u79ef\u4e3a\u5927\u4e09\u89d2\u5f62\u7684\u9762\u79ef\u51cf\u53bb\u5de6\u4e0b\u89d2\u7684\u9762\u79ef\uff1a
\uff088+6\uff09\u00d78\u00f72\u2014\uff088\u00d78\u20143.14\u00d78\u00d78\u00f74\uff09
=56\u201413.76
=42.24(\u5e73\u65b9\u5398\u7c73\uff09
=（5÷2）²×3.14÷2-（3÷2）²×3.14÷2-（2÷2）²×3.14÷2
=9.8125-3.5325-1.57
=4.71（厘米²）
绛旓細绛旓細闃村奖閮ㄥ垎鐨勯潰绉槸39.25骞虫柟鍘樼背锛
绛旓細闃村奖閮ㄥ垎鐨勯潰绉=3.14脳5脳5梅2-5脳5梅2=26.75骞虫柟鍘樼背
绛旓細=4.71锛鍘樼背²锛
绛旓細3.14X2X2/4-2X2/2=3.14-2=1.14
绛旓細灏忕殑鍗婂渾闈㈢Н锛歋2=蟺r²/2=蟺脳2²/2=2蟺銆傛墍浠ワ細S闃村奖=S1-S2=8蟺-2蟺=6蟺=6脳3.14=18.84锛坈m²锛夈傦紙2锛夊崐鍦嗙殑鐩村緞涓10cm锛屽垯鍗婂緞涓篟=5锛坈m锛夛紝鍥犳姊舰鐨勯珮搴︿篃涓5cm銆傚崐鍦鐨勯潰绉細S1=蟺R²/2=蟺脳5²/2=12.5蟺=12.5脳3.14=39.25锛坈m²...
绛旓細鍦嗙殑闈㈢Н锛3.14脳4 2 锛=3.14脳16锛=50.24锛堝钩鏂鍘樼背锛夛紱鍥犱负姝ｆ柟褰㈢殑闈㈢Н鏄湁4涓畬鍏ㄤ竴鏍风殑鐩磋涓夎褰AB鐨勯潰绉粍鎴愮殑锛屾墍浠ユ鏂瑰舰鐨勯潰绉槸锛4脳4脳4梅2锛=64梅2锛=32锛堝钩鏂瑰帢绫筹級锛涢槾褰遍儴鍒嗙殑闈㈢Н锛50.24-32=18.24锛堝钩鏂瑰帢绫筹級锛涚瓟锛氾紙1锛夐槾褰遍儴鍒嗙殑闈㈢Н鏄12骞虫柟鍘樼背锛涳紙2锛夐槾褰遍儴鍒...
绛旓細锛1锛5脳5-3.14脳锛5梅2锛2梅2=25-9.8125=15.1875锛堝钩鏂鍘樼背锛夛紟绛旓細闃村奖閮ㄥ垎闈㈢Н鏄15.1875骞虫柟鍘樼背锛庯紙2锛3.14脳锛52-32锛=3.14脳16=50.24锛堝钩鏂瑰帢绫筹級锛庣瓟闃村奖閮ㄥ垎闈㈢Н鏄50.24骞虫柟鍘樼背锛庯紙3锛10脳6-3.14脳锛6梅2锛2=60-28.26=31.74锛堝钩鏂瑰帢绫筹級锛庣瓟锛氶槾褰遍儴鍒嗛潰绉槸31.74...
绛旓細鍒嗘瀽锛氾紙1锛夊浘涓槾褰遍儴鍒嗙殑闈㈢Н鏄暱鏂瑰舰闈㈢Н鐨勪竴鍗婏紟锛2锛夊浘涓槾褰遍儴鍒嗙殑闈㈢Н鏄钩琛屽洓杈瑰舰闈㈢Н鐨勪竴鍗婏紟锛1锛3.6脳1.2梅2=4.32梅2=2.16锛堝钩鏂鍘樼背锛夌瓟锛氶潰绉槸2.16骞虫柟鍘樼背锛庯紙2锛22脳16梅2=352梅2=176锛堝钩鏂瑰帢绫筹級绛旓細闃村奖閮ㄥ垎鐨勯潰绉槸176骞虫柟鍘樼背锛庣偣璇勶細鏈涓昏鑰冩煡浜嗗鐢熷涓夎褰㈢殑...
绛旓細鐢ㄦ褰闈㈢Н鍑忓幓涓や釜鍥涘垎涔嬩竴鍦嗛潰绉氨鍙互锛屽涓嬪浘锛岄潰绉4.875cm²
绛旓細锛1锛夐槾褰遍儴鍒嗛潰绉=锛8+15锛壝楋紙8梅2锛壝2-锛8梅2锛²脳3.14梅2 =46-25.12 =20.88锛堝钩鏂鍘樼背锛夛紙2锛夐槾褰遍儴鍒嗛潰绉=10脳锛10脳2锛-锛10脳2锛壝10梅2 =200-100 =100锛堝钩鏂瑰帢绫筹級锛3锛夐槾褰遍儴鍒嗛潰绉=8²脳3.14梅4-锛8梅2锛²脳3.14梅2 =50.24-25.12 =25.12...
