实验小学的操场如下图所示,这个操场的周长是多少米?跑道的宽度是1.2m,欢欢和笑笑
\u5b9e\u9a8c\u5c0f\u5b66\u7684\u64cd\u573a\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u8fd9\u4e2a\u64cd\u573a\u7684\u5468\u957f\u662f\u591a\u5c11\u7c73\uff1f\u8dd1\u9053\u7684\u5bbd\u5ea6\u662f1.2\u7c73\uff0c\u6b22\u6b22\u548c\u7b11\u7b11\u5728\u76f8\u90bb\u7684\u8dd1\u9053\u4e0a\u6bd4\u64cd\u573a\u7684\u5468\u957f=3.14\u00d770+90\u00d72=399.8\u7c73\u2248400\u7c73
3.14\u00d7[(35+1.2)\u00d72-2\u00d735]=7.536\u7c73
\u5979\u4eec\u7684\u8d77\u8dd1\u7ebf\u5e94\u76f8\u5dee7.536\u7c73
\u64cd\u573a\u7684\u5468\u957f=3.14\u00d770+90\u00d72=399.8\u7c73\u2248400\u7c73
3.14\u00d7[(35+1.2)\u00d72-2\u00d735]=7.536\u7c73
\u5979\u4eec\u7684\u8d77\u8dd1\u7ebf\u5e94\u76f8\u5dee7.536\u7c73
绛旓細鎿嶅満鐨勫懆闀=3.14脳70+90脳2=399.8绫斥増400绫 3.14脳[(35+1.2)脳2-2脳35]=7.536绫 濂逛滑鐨勮捣璺戠嚎搴旂浉宸7.536绫
绛旓細鐩稿樊2蟺d=2蟺*1.2=7.536m
绛旓細鎿嶅満鐨勫懆闀=3.14脳70+90脳2=399.8绫斥増400绫 3.14脳[(35+1.2)脳2-2脳35]=7.536绫 濂逛滑鐨勮捣璺戠嚎搴旂浉宸7.536绫
绛旓細鑽夊潽闈㈢Н鏄乏鍙宠崏鍧姞涓婁腑闂寸殑闀挎柟褰㈣崏鍧 S=蟺R²+100*2*R=400蟺+4000=5256m²
绛旓細闀挎柟褰㈣崏鍧細闀=100m锛屽=20*2-5*2=30m 鎵浠ワ紝闀挎柟褰㈣崏鍧潰绉=100*30=3000 m^2 鍗婂渾褰㈣崏鍧細鍗婂緞=20-5=15m 鎵浠ワ紝鍗婂渾褰㈣崏鍧潰绉=蟺*15^2=225蟺 m^2 鍥犳锛屾搷鍦鑽夊潽闈㈢Н=3000+2*225蟺=(3000+450蟺) m^2 锛堢害绛変簬4413骞虫柟绫筹級...
绛旓細宸茬煡100m涓洪暱鏂瑰舰鐨勯暱锛屽鍒欐槸鍗婂渾鐨勭洿寰勫噺鐜涔熷氨鏄20脳2-5脳2=30m 闀挎柟褰㈢殑闈㈢Н灏辨槸100脳30=3000銕 鑰屼袱涓崐鍦嗘嫾鍦ㄤ竴璧峰氨鏄竴涓洿寰勪笌闀挎柟褰㈢殑瀹界浉绛夌殑鍦嗭紙濡備笂杩帮紝鍦嗙殑鐩30m锛夊渾鐨勯潰绉氨鏄3.14脳锛½脳30锛²=706.5銕 鑽夊潽鎬婚潰绉氨鏄3000+706.5=3706.5銕 鏈涢噰绾 ...
绛旓細20*2*100=4000骞虫柟绫筹紙姹備腑闂撮暱鏂瑰舰鐨勯潰绉級3.14*20²=1256骞虫柟绫筹紙姹備袱涓崐鍦嗗悎璧锋潵鎴愪竴涓渾鐨勯潰绉級4000+1256=5256骞虫柟绫筹紙鑽夊潽鐨勯潰绉級鍏跺疄杩欓亾棰樼殑璺戦亾鐨勫凡鐭ユ潯浠舵槸澶氫綑鐨
绛旓細鐢卞凡鐭ユ潯浠跺緱鐭ワ細鎿嶅満鏄敱涓涓暱100锛屽5鐨勯暱鏂瑰舰鍜屽崐寰勪负20鐨勫渾褰紙涓や釜鍗婂渾锛夌粍鎴愮殑 鎵浠 鎿嶅満闈㈢Н=闀挎柟褰㈤潰绉紙100*5锛+鍦嗗舰闈㈢Н锛埾r² 3.14*20*20锛=500+1256=1756銕
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