一个无盖的圆柱形铁皮水桶，底面半径30cm，高50cm，做这个水桶需要多少铁皮，如果每升水重1kg 一个无盖的圆柱形铁皮水桶，底面半径30厘米，高50厘米，做这...
\u4e00\u4e2a\u65e0\u76d6\u7684\u5706\u67f1\u5f62\u94c1\u76ae\u6c34\u6876,\u5e95\u9762\u534a\u5f8430cm,\u9ad850cm\uff0c\u505a\u8fd9\u4e2a\u6c34\u6876\u9700\u8981\u591a\u5c11\u94c1\u76ae\uff1f\u5982\u679c\u6bcf\u5347\u6c34\u91cd1kg\u4e00\u4e2a\u65e0\u76d6\u7684\u5706\u67f1\u5f62\u94c1\u76ae\u6c34\u6876,\u5e95\u9762\u534a\u5f8430cm,\u9ad850cm\uff0c\u505a\u8fd9\u4e2a\u6c34\u6876\u9700\u8981\u591a\u5c11\u94c1\u76ae\uff1f\u5982\u679c\u6bcf\u5347\u6c34\u91cd1kg\uff0c\u8fd9\u4e2a\u6c34\u6876\u80fd\u88c5\u6c34\u591a\u5c11\u5343\u514b\uff1f
\u94c1\u76ae3.14\u00d730²+3.14\u00d730\u00d72\u00d750
=3.14\u00d7900+3.14\u00d73000
=3.14\u00d73900
=12246\u5e73\u65b9\u5398\u7c73
\u88c5\u6c341\u00d7\uff083.14\u00d730²\u00d750\u00f71000\uff09
=1\u00d7141.3
=141.3\u5343\u514b
30\u5398\u7c73=3\u5206\u7c73\uff0c50\u5398\u7c73=5\u5206\u7c73\uff0e\uff081\uff09\u6c34\u6876\u7684\u4fa7\u9762\u79ef\uff1a2\u00d73.14\u00d73\u00d75=94.2\uff08\u5e73\u65b9\u5206\u7c73\uff09\uff1b\u6c34\u6876\u7684\u5e95\u9762\u79ef\uff1a3.14\u00d73 2 \uff0c=3.14\u00d79\uff0c=28.26\uff08\u5e73\u65b9\u5206\u7c73\uff09\uff1b\u6c34\u6876\u7684\u8868\u9762\u79ef\uff1a94.2+28.26=122.46\uff08\u5e73\u65b9\u5206\u7c73\uff09\uff1b\u7b54\uff1a\u505a\u8fd9\u4e2a\u6c34\u6876\u9700\u8981122.467\u5e73\u65b9\u5206\u7c73\u7684\u94c1\u76ae\uff0e\uff082\uff09\u6c34\u6876\u7684\u5bb9\u79ef\uff1a3.14\u00d73 2 \u00d75\uff0c=3.14\u00d79\u00d75\uff0c=141.3\uff08\u7acb\u65b9\u5206\u7c73\uff09\uff0c=141.3\uff08\u5347\uff09\uff1b\u8fd9\u4e2a\u6c34\u6876\u80fd\u88c5\u6c34\uff1a1\u00d7141.3=141.3\uff08\u5343\u514b\uff09\uff1b\u7b54\uff1a\u8fd9\u4e2a\u6c34\u6876\u80fd\u88c5\u6c34141.3\u5343\u514b\uff0e
S=(2*30*π)*50+30*30*π=12246㎝²V=30*30*π*50=141300ml.=141.3l
铁皮11932平方厘米，体积公式我忘了
绛旓細闇瑕閾佺毊锛50.24+125.6=175.84锛堝钩鏂瑰垎绫筹級鑳借锛50.24脳5=251.2锛堢珛鏂瑰垎绫筹級=251.2锛堝崌锛
绛旓細绛旓細鍋氳繖涓姘存《鑷冲皯闇瑕1758.4骞虫柟鍘樼背閾佺毊銆
绛旓細[3.14脳0.4脳0.8+3.14脳锛0.4梅2锛 2 ]脳2锛=[3.14脳0.4脳0.8+3.14脳0.1256]脳2锛=[1.0048+0.1256]脳2锛=1.1304脳2=2.2608锛屸増2.3锛堝钩鏂圭背锛夛紱绛旓細娌规紗鐨勯潰绉ぇ绾︽槸2.3骞虫柟绫
绛旓細瑙ｏ細姘存《鐨勫簳闈鍗婂緞涓 4 / 2 =2 鍒嗙背 姘存《鐨搴曢潰绉负 3.14脳2^ =12.56 骞虫柟鍒嗙背 渚ч潰绉负 3.14脳4脳4.5 = 56.52 骞虫柟鍒嗙背 鍏遍渶閾佺毊 12.56 + 56.52 = 69.08锛堝钩鏂瑰垎绫筹級
绛旓細搴曢潰鐩村緞=6鍒嗙背锛屽崐寰=3鍒嗙背銆傚仛杩欎釜姘存《鑷冲皯瑕佺敤=3.14脳3脳3+3.14脳6脳6=141.3骞虫柟鍒嗙背
绛旓細3.1416脳30²+2脳3.1416脳50梅100=2830.5816骞虫柟绫 3.1416脳30²脳50梅100=1413.72绔嬫柟绫 绛旓細濡傛灉涓嶈冭檻鎺ョ紳鐨鍥犵礌鍋氭姘存《闇2830.5816骞虫柟绫閾佺毊锛屾渶澶氳兘瑁1413锛.72绔嬫柟绫虫按銆傦紙杩欎篃涓嶆槸姘存《锛鍒嗘槑鏄釜闈炲父澶х殑閾佺洏锛
绛旓細1銆佸簳鐨勯潰绉=鍦嗙殑闈㈢Н =鈭廟²=3.14脳(0.4/2)²=3.14脳0.04=0.04鈭弇²2銆佷晶闈㈢Н=鍛ㄩ暱脳楂 =2鈭廟脳H=2鈭徝0.2脳0.8=3.2鈭弇²鎵浠:娌规紗闈㈢Н=搴曢潰绉+渚ч潰绉 =0.04鈭+3.2鈭=3.24鈭=3.24脳3.14 =10.1736=10.2m²甯屾湜鑳藉府鍒颁綘锛屾湜閲囩撼锛
绛旓細姹傛墍鐢鐨勯搧鐨鐨勯潰绉紝瀹為檯涓婃槸姹傚畠鐨勮〃闈㈢Н锛岃繖涓槸鍦嗘煴褰㈡棤鐩栭搧鐨按妗讹紝鎵浠ヨ〃闈㈢Н=渚ч潰绉+搴曢潰绉 鍦嗘煴渚ч潰绉=搴曢潰鍛ㄩ暱*楂=蟺dh 搴曢潰绉=蟺r²r=d/2=4/2=2(鍒嗙背)鎵浠ワ紝鏍规嵁浠ヤ笂鍏紡锛屼唬鍏ユ暟鎹彲寰 閾佺毊闈㈢Н=渚ч潰绉+搴曢潰绉 =蟺dh+蟺r²=3.14*4*5+3.14*2²=3.14*20+...
绛旓細杩欓亾棰樻槸姹傝繖涓姘存《鐨勫唴澶栦晶闈㈢Н涓庝袱涓簳闈㈢Н 搴曢潰绉负锛氾箼0.4梅2锕毭楋箼0.4梅2锕毭3.14脳2 锛0.04脳3.14脳2 锛0.1256脳2 锛0.2512 鈮0.3 锕欏钩鏂圭背锕鍦嗘煴浣渚ч潰绉负锛0.4脳3.14脳0.8脳2 锛1.256脳0.8脳2 锛1.0048 锛2.0096 鈮2 锕欏钩鏂圭背锕氱患鍚堢畻寮忥細锕0.4梅2锕毭楋箼0...
绛旓細=28.26锛堝钩鏂瑰垎绫筹級锛姘存《鐨勮〃闈㈢Н锛94.2+28.26=122.46锛堝钩鏂瑰垎绫筹級锛涚瓟锛氬仛杩欎釜姘存《闇瑕122.467骞虫柟鍒嗙背鐨勯搧鐨锛庯紙2锛夋按妗剁殑瀹圭Н锛3.14脳3 2 脳5锛=3.14脳9脳5锛=141.3锛堢珛鏂瑰垎绫筹級锛=141.3锛堝崌锛夛紱杩欎釜姘存《鑳借姘达細1脳141.3=141.3锛堝崈鍏嬶級锛涚瓟锛氳繖涓按妗惰兘瑁呮按141.3鍗冨厠锛
