一个无盖的的圆柱形铁皮水桶,底面半径20厘米,高50厘米，做这个水桶需要多少铁皮？如果每升水重1千克， 做一个无盖的圆柱形铁皮水桶底面半径面积20厘米高50厘米做这...
\u4e00\u4e2a\u65e0\u76d6\u7684\u5706\u67f1\u5f62\u94c1\u76ae\u6c34\u6876,\u5e95\u9762\u534a\u5f84\u662f20\u5398\u7c73\uff0c\u9ad8\u662f50\u5398\u7c73\u3002\uff081\uff09\u505a\u8fd9\u4e2a\u6c34\u6876\u9700\u8981\u591a\u5c11\u94c1\u76ae?(2)\u5982\u679c\u6bcf\u5347\u6c34\u91cd@\u201c\u7406 \u79d1 \u5bb6 \u6559\u201d \u4e3a\u4f60\u7b54\u7591
\u5e95\u9762\u79ef\uff1a20*20*3.14=1256\u5e73\u65b9\u5398\u7c73
\u4fa7\u9762\u79ef\uff1a20*2*3.14*50=6280\u5e73\u65b9\u5398\u7c73
\u9700\u8981\u591a\u5c11\u94c1\u76ae\uff1a1256+6280=7536\u5e73\u65b9\u5398\u7c73
\u4f53\u79ef\uff1a1256*50=62800\u7acb\u65b9\u5398\u7c73=62.8\u5347
\u88c5\u6c34\u591a\u5c11\u5343\u514b\uff1a62.8*1=62.8\u5343\u514b
@\u82e5\u4e0d\u6e05\u695a\u6b22\u8fce\u8ffd\u95ee\uff0c\u61c2\u4e86\u8bf7\u53ca\u65f6\u91c7\u7eb3 \uff01\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65\uff01
\u505a\u4e00\u4e2a\u65e0\u76d6\u7684\u5706\u67f1\u5f62\u94c1\u76ae\u6c34\u6876\uff0c\u5e95\u9762\u534a\u5f84\u9762\u79ef20\u5398\u7c73\uff0c\u9ad850\u5398\u7c73\uff0c\u505a\u8fd9\u4e2a\u6c34\u6876\u9700\u8981\u94c1\u76ae50*20*2*3.14+20*20*3.14\uff1d7536\u5e73\u65b9\u5398\u7c73\u3002
緈福の【角落】，你好：需要铁皮：3.14×20²＋2×3.14×20×50＝7536（平方厘米）
水桶容积：3.14×20²×50＝62800（立方厘米）＝62.8（升）
水桶装水：62.8×1×4/5＝50.24（千克）
3.14*2*20*50+3.14*20*20=6280+125.6=6405.6（平方厘米）
绛旓細鍦嗘煴鐨浣撶Н=搴曢潰绉楅珮=蟺r^2*H 搴曢潰鍗婂緞鏄細30/2=15鍘樼背 1绔嬫柟鍘樼背=0.001鍗 3.14脳15脳15脳50 =35325绔嬫柟鍘樼背 =35.325鍗 淇濈暀鏁存暟锛屽彇35銆傜瓟锛氭渶澶氳兘鐩涙按35鍗囥倊绁濆涔犺繘姝ャ
绛旓細涓涓棤鐩栫殑鍦嗘煴褰㈤搧鐨按妗,搴闈㈠崐寰30cm,楂50cm锛屽仛杩欎釜姘存《闇瑕佸灏戦搧鐨紵濡傛灉姣忓崌姘撮噸1kg锛岃繖涓按妗惰兘瑁呮按澶氬皯鍗冨厠锛熼搧鐨3.14脳30²+3.14脳30脳2脳50 =3.14脳900+3.14脳3000 =3.14脳3900 =12246骞虫柟鍘樼背 瑁呮按1脳锛3.14脳30²脳50梅1000锛=1脳141.3 =141.3鍗冨厠 ...
绛旓細搴曢潰鍗婂緞30鍘樼背=0.3绫,楂50鍘樼背=0.5绫,娲惧彇3.14,搴闈㈢Н=3.14X0.3^2=0.2826骞虫柟绫 渚ч潰绉=0.5X2X3.14X0.3=0.942骞虫柟绫 鎵浠,鍋氳繖涓姘存《闇瑕閾佺毊=0.2826+0.942=1.2246骞虫柟绫
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+...
绛旓細锛2锛夋牴鎹渾鏌辩殑瀹圭Н锛堜綋绉級鍏紡锛歷=sh锛屾眰鍑烘按妗剁殑瀹圭Н锛屽啀鏍规嵁瀹圭Н鍗曚綅鍜屼綋绉殑鎹㈢畻鏂规硶锛屾崲绠楁垚瀹圭Н鍗曚綅鍗冲彲銆傘愯В绛斻戣В锛氾紙1锛夊仛杩欎釜姘存《闇瑕佺殑閾佺毊 =鍦嗘煴褰㈤搧鐨按妗鐨勪晶闈㈢Н+涓涓簳闈㈢Н =3.14脳20脳50+3.14脳(20梅2)²=62.8脳50+3.14脳100 =3140+314 =3454(cm²)锛2...
绛旓細涓涓渾鏌卞舰鏃犵洊鐨勯搧鐨按妗跺簳闈㈢殑鏄628鍘樼背锛岄珮鏄35鍘樼背锛屽仛杩欐牱涓涓按绠遍渶瑕628脳35+(628梅2蟺)²脳蟺=21980+31400=53380骞虫柟鍘樼背=533.8骞虫柟鍒嗙背=5.338骞虫柟绫炽
绛旓細S=400+6280=6680骞虫柟鍘樼背鐨勯搧鐨 浜屾槸:涓嶈冭檻鐣欒竟,涓嶈冭檻鐢ㄦ枡,鍙冭檻鍦嗘煴褰㈤搧鐨按妗鐨勯潰绉 搴曠敤鏂欌垙20*20/2=628骞虫柟鍘樼背鐨勯搧鐨仛鎴姘存《搴 渚ч潰鐢ㄦ枡:s=2蟺rl 2*3.14*20*50=6280骞虫柟鍘樼背鐨勯搧鐨仛鎴愭按妗朵晶闈 鎬诲叡鐢ㄦ枡搴+渚ч潰 S=628+6280=6908骞虫柟鍘樼背鐨勯搧鐨 闂浜岃В绛:杩欐槸浣撶Н闂 绗涓涓灏忛棶棰...
绛旓細搴曢潰鍗婂緞=3/2=1.5锛堝垎绫筹級搴曢潰闈㈢НS=3.14*1.5*11.5=7.065锛堝钩鏂瑰垎绫筹級渚ч潰绉疭=2*3.14*1.5*4=37.68(骞虫柟鍒嗙背锛37.68+7.065=44.745锛堝钩鏂瑰垎绫筹級绛旓細鍋氳繖鏍鐨勪竴涓按妗鑷冲皯闇瑕閾佺毊44.745骞虫柟鍒嗙背銆
绛旓細鍏跺疄杩欏氨鏄绠鍦嗘煴琛ㄩ潰绉殑棰樼洰锛屽彧涓嶈繃鍘诲埌涓涓鈥滃簳鈥濄3.14脳锛20梅2锛²+3.14脳20脳45 =3.14 脳100 +3.14脳900 =3.14 脳锛100+900锛= 3.14 脳1000 =3140锛堝钩鏂瑰帢绫筹級=0.314锛堝钩鏂圭背锛
绛旓細30鍘樼背锛3鍒嗙背銆40鍘樼背锛4鍒嗙背 瑕佷集鐨3X3X3.14+3X2X3.14X4锛28.26+75.36锛103.62骞虫柟鍒嗙背 瑁呮按銆3X3X3.14X4X1锛113.04鍗冨厠
