用4个棱长1分米的正方体木块拼成一个长方体。表面积之和最少减少（ ）%，最多呢 4个棱长1分米的正方体,拼成一个长方体,表面积减少多少?怎么...
\u4e09\u4e2a\u6b63\u65b9\u4f53\u62fc\u6210\u4e00\u4e2a\u957f\u65b9\u4f53\u540e\uff0c\u8868\u9762\u79ef\u51cf\u5c11\u4e86100\u5e73\u65b9\u5398\u7c73\uff0c\u90a3\u4e48\u957f\u65b9\u4f53\u7684\u4f53\u79ef\u662f\u591a\u5c11\u7acb\u65b9\u5398\u7c73\uff1f\u89e3\uff1a\u8868\u9762\u79ef\u51cf\u5c11\u662f\u56e0\u4e3a\u5c11\u4e864\u4e2a\u9762\uff0c\u5219\u6b63\u65b9\u4f53\u4e00\u4e2a\u9762\u7684\u9762\u79ef\u4e3a100 \u00f7 4 = 25\uff08cm²\uff09
\u6b63\u65b9\u4f53\u7684\u68f1\u957f\u4e3a 5 \uff08cm\uff09
\u6240\u4ee5\u4f53\u79ef\u4e3a\uff1a
25 \u00d7 \uff085 \u00d7 3 \uff09
= 25 \u00d7 15
= 375\uff08cm³\uff09
\u7b54\uff1a\u8fd9\u4e2a\u957f\u65b9\u4f53\u7684\u4f53\u79ef\u662f375\u7acb\u65b9\u5398\u7c73\u3002
\u6bb5\u74a7\u7457\uff0c\u4f60\u597d\uff1a
4\u4e2a\u6b63\u65b9\u4f53\u62fc\u6210\u957f\u65b9\u4f53\u8981\u62fc\uff1a4\uff0d1\uff1d3\uff08\u6b21\uff09
\u4e00\u62fc\u5c11\u4e24\u4e2a\u9762\uff0c\u9762\u4e00\u5171\u5c11\u4e86\uff1a3\u00d72\uff1d6\uff08\u4e2a\uff09
\u8868\u9762\u79ef\u51cf\u5c11\u4e86\uff1a1\u00d71\u00d76\uff1d6\uff08\u5e73\u65b9\u5206\u7c73\uff09
绛旓細瑙ｏ細鎶4涓１闀鏄1鍘樼背鐨勬鏂逛綋鏈ㄥ潡鎷鎴涓涓暱鏂逛綋锛屾湁涓ょ涓嶅悓鐨勬嫾缁勬柟娉曪細4脳1鎺掑垪锛岄暱瀹介珮鍒嗗埆涓猴細4鍘樼背銆1鍘樼背銆1鍘樼背闀挎柟浣撶殑琛ㄩ潰绉細(4脳1+4脳1+1脳1)脳2=18锛堝钩鏂瑰帢绫筹級2脳2鎺掑垪锛岄暱瀹介珮鍒嗗埆涓猴細2绫炽2鍘樼背銆1鍘樼背闀挎柟浣撹〃闈㈢Н涓猴細锛2脳2+2脳1+2脳1锛壝2=16锛堝钩鏂瑰帢绫筹級...
绛旓細=锛4+4+1锛壝2锛=9脳2锛=18锛堝钩鏂瑰垎绫筹級锛18骞虫柟鍒嗙背=1800骞虫柟鍘樼背锛涳紙2锛2脳2鎺掑垪锛氶暱瀹介珮鍒嗗埆涓猴細2鍒嗙背銆2鍒嗙背銆1鍒嗙背锛岃〃闈㈢Н涓猴細锛2脳2+2脳1+2脳1锛壝2锛=锛4+2+2锛壝2锛=8脳2锛=16锛堝钩鏂瑰垎绫筹級锛
绛旓細浣犲ソ锛鐢4涓１闀1鍒嗙背鐨灏姝ｆ柟浣撴湪鍧楁嫾鎴愪竴涓ぇ闀挎柟浣,杩欎釜澶ч暱鏂逛綋鐨勮〃闈㈢Н鏈澶ф槸锛18骞虫柟鍒嗙背锛夛紝閭ｆ渶灏忥紙16骞虫柟鍒嗙背锛
绛旓細鍥炵瓟锛氶暱鏂逛綋浣撶Н=1脳4=4绔嬫柟鍒嗙背,鐢板瓧鎺掑垪,琛ㄩ潰绉渶灏=1脳16=16骞虫柟鍒嗙背銆
绛旓細鎶4涓１闀挎槸1鍒嗙背鐨勬鏂逛綋鎷兼垚闀鏂逛綋,鎷兼垚鐨勯暱鏂逛綋鐨勮〃闈㈢Н鍙兘鏄紙18锛夊钩鏂瑰垎绫,涔熷彲鑳芥槸锛16骞虫柟鍒嗙背锛
绛旓細16鎴18
绛旓細锛1锛1脳1脳6脳4-1脳1脳8锛=24-8锛=16锛堝钩鏂鍒嗙背锛夛紝1脳1脳6脳4-1脳1脳6锛=24-6锛=18锛堝钩鏂瑰垎绫筹級锛岋紙2锛1脳1脳1脳4=4锛堢珛鏂瑰垎绫筹級锛岀瓟锛氳繖涓暱鏂逛綋鐨勮〃闈㈢Н鏄16骞虫柟鍒嗙背鎴18骞虫柟鍒嗙背锛涗綋绉槸4绔嬫柟鍒嗙背锛庢晠绛旀涓猴細16鎴18锛4锛
绛旓細鍑忓皯鐨勬槸鍏釜閲嶅彔闈㈢殑琛ㄩ潰绉紝鍗冲噺灏8骞虫柟鍒嗙背锛岃屽師琛ㄩ潰绉箣鍜屼负6*4=24锛屾墍浠ュ噺灏25
绛旓細鍥涗釜姝ｆ柟浣锛岄兘鏄 1X1X1锛鎷肩殑涓闀挎潯锛屾槸 4X1X1锛岄暱鏂逛綋鐨勫叚涓钩闈紝鏄洓涓 1X4锛屽拰涓や釜 1X1锛岃〃闈㈢Н灏辨槸 4X4 +2 =16+2 =18銆傛嫾寰楀儚鐢板瓧锛屾槸 2X2X1锛岄暱鏂逛綋鐨勫叚涓钩闈紝鏄洓涓 2X1锛屽拰涓や釜 2X2锛岃〃闈㈢Н灏辨槸 4X2 +2X4 =8+8 =16銆傝繖鏍风湅鐪嬶紝璋佸ぇ璋佸皬锛屼竴鐩簡鐒躲傝繖绉嶉棶棰橈紝...
绛旓細绛旓細1銆佸彲鑳芥槸鎸1*4鎷锛岃〃闈㈢Н鏄4*6*1²-6*1²=18骞虫柟鍒嗙背 2銆佸彲鑳芥槸鎸2*2鎷硷紝琛ㄩ潰绉槸4*6*1²-8*1²=16骞虫柟鍒嗙背
