做一个长方体铁皮水桶无盖，长和宽都是5分米，高是6分米，问至少需要多少平方分米的铁皮。
\u505a\u4e00\u4e2a\u65e0\u76d6\u957f\u65b9\u4f53\u94c1\u76ae\u6c34\u6876\uff0c\u957f\u548c\u5bbd\u90fd\u662f5\u5206\u7c73\uff0c\u9ad8\u662f6\u5206\u7c73\uff0c\u81f3\u5c11\u8981\u591a\u5c11\u5e73\u65b9\u5206\u7c73\u524d\u540e\u4e24\u4e2a\u9762\u7684\u9762\u79ef\uff1a5\u00d76\u00d72\uff1d60\uff08\u5e73\u65b9\u5206\u7c73\uff09
\u5de6\u53f3\u4e24\u4e2a\u9762\u7684\u9762\u79ef\uff1a5\u00d76\u00d72\uff1d60\uff08\u5e73\u65b9\u5206\u7c73\uff09
\u4e0b\u9762\u4e00\u4e2a\u9762\u7684\u9762\u79ef\uff1a5\u00d75\uff1d25\uff08\u5e73\u65b9\u5206\u7c73\uff09
\u4e94\u4e2a\u9762\u7684\u603b\u9762\u79ef\uff1a60\uff0b60\uff0b25\uff1d145\uff08\u5e73\u65b9\u5206\u7c73\uff09
8\u00d75+\uff088\u00d76+5\u00d76\uff09\u00d72
=40+156
=196\u5e73\u65b9\u5206\u7c73
8\u00d75\u00d75=200\u7acb\u65b9\u5206\u7c73
绛旓細鍋氳繖涓按妗鑷冲皯瑕佺敤閾佺毊锛3脳3+3脳5脳4=9+60=69骞虫柟鍒嗙背 杩欎釜姘存《鍙姘达細3脳3脳5=45绔嬫柟鍒嗙背=45鍗
绛旓細4脳4锛4脳4脳6锛112锛堝钩鏂瑰垎绫筹級绛旓細鍋氳繖涓按妗闇瑕閾佺毊112骞虫柟鍒嗙背.
绛旓細灏辨槸鍏釜闈㈢殑闈㈢Н鍑忓幓鐩栧瓙鐨勯潰绉氨鍙互鍟︼紝鏄0.74骞虫柟鍒嗙背
绛旓細閾佺毊鏁伴噺涓闀挎柟浣琛ㄩ潰绉噺鍘讳笂鐩栭潰绉 锛5*3+5*3+3*3锛*2-3*3=69骞虫柟鍒嗙背=0.69骞虫柟绫 鎵浠鍋氫竴涓杩欐牱鐨姘存《鑷冲皯闇瑕佺敤閾佺毊0.69骞虫柟绫
绛旓細闂涓锛氶渶閾佺毊30*20+30*15*2+15*20*2=2100骞虫柟鍘樼背=21骞虫柟鍒嗙背 娉ㄦ剰鐐癸細鈶犵敱浜鏃犵洊锛鍙渶绠椾簲涓潰銆傗憽绠楀ソ鍚庯紝瑕佹妸骞虫柟鍘樼背鎹㈢畻鎴愬钩鏂瑰垎绫炽1骞虫柟鍒嗙背=100骞虫柟鍘樼背 闂浜屻佸彲瑁呮按30*15*20=9000绔嬫柟鍘樼背=9鍗 娉ㄦ剰鐐癸細鈶犲嵆涓烘眰闀挎柟浣鐨勪綋绉 鈶′竴鍗=1绔嬫柟鍒嗙背锛屾墍浠ヨ鎶婄粨鏋滅殑绔嬫柟鍘樼背鎹㈢畻...
绛旓細鍠461锛屼綘濂斤細鑷冲皯鐢閾佺毊锛0.6脳0.6锛0.6脳0.5脳4锛1.56锛堝钩鏂圭背锛夊畠鐨勫绉槸锛0.6脳0.6脳0.5锛0.18锛堢珛鏂圭背锛
绛旓細4脳4+4脳5脳4=16+80=96锛堝钩鏂瑰帢绫筹級4脳4脳5=80锛堢珛鏂瑰垎绫筹級=80锛堝崌锛夌瓟锛鍋氫竴涓杩欐牱鐨勬按妗惰嚦灏戦渶瑕閾佺毊96骞虫柟鍘樼背锛岃繖涓按妗鐨勫绉槸80鍗囷紟
绛旓細185骞虫柟鍒嗙背
绛旓細30鍘樼背=3鍒嗙背 瑕佺敤閾佺毊锛8脳5+5脳3脳2+3脳8脳2=118绔嬫柟鍒嗙背 瀹圭Н锛8脳5脳3=120绔嬫柟鍒嗙背=120鍗
绛旓細16.56-2R)鍒嗙背锛屽渾鏌辩殑楂樼瓑浜2R鍒嗙背锛屾湁鏂圭▼锛3.14脳2R=16.56-2R 6.28R=16.56-2R 6.28R+2R=16.56 8.28R=16.56 R=16.56梅8.28 R=2 鍦嗘煴鐨勯珮绛変簬2R=2脳2=4 鍦嗘煴鐨勪綋绉瓑浜庯細3.14脳2²脳4=50.24绔嬫柟鍒嗙背 绛旓細杩欎釜鏃犵洊鐨姘存《鐨勪綋绉槸50.24绔嬫柟鍒嗙背 ...
