一个正方形用四根木棒两个正方形至少要几根木棒 摆1个正方形用4根小棒,摆3个同样大小的正方形,至少需要多少...
\u6309\u5982\u56fe\u6240\u793a\u7684\u56fe\u5f62\uff0c\u642d\u4e00\u4e2a\u6b63\u65b9\u5f62\u9700\u8981\u56db\u6839\u6728\u68d2\u4e24\u4e2a\u6b63\u65b9\u5f62\u9700\u8981\u4e03\u6839\u6728\u68d2\u642d\u4e09\u4e2a\u6b63\u65b9\u5f62\uff0c\u9700\u8981\u5341\u6839\u6728\u68d2\u642dn\u4e2a\u7b54\uff1a 1x3+1=4 2x3+1=7 3x3+1=10 \u4ee5\u6b64\u7c7b\u63a8 n\u4e2a\u9700\u89813n+1\u6839\u3002
\u64461\u4e2a\u6b63\u65b9\u5f62\u75284\u6839\u5c0f\u68d2,\u64463\u4e2a\u540c\u6837\u5927\u5c0f\u7684\u6b63\u65b9\u5f62,\u81f3\u5c11\u9700\u898110\u6839\u5c0f\u68d2
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绛旓細4+3=7鏍 鍥炵瓟瀹屾瘯~鏈夌枒闂杩介棶锛屾垜涓瀹氬敖蹇洖澶嶄綘~鏃犵枒闂鐐瑰嚮銆愰噰绾炽戯紝鍚屾椂棰勭瀛︿範杩涙~\(^o^)/~鎴戜笉鏄闇革紝鍙垜璧岀~\(^o^)/~~\(^o^)/~~\(^o^)/~~\(^o^)/~
绛旓細鎵浠ワ細3n+1=121锛岃В寰楋細n=40 绛旓細121鏍瑰皬妫掕兘鎽40涓姝ｆ柟褰銆
绛旓細绗竴涓姝ｆ柟浣撻渶瑕4鏍圭伀鏌存锛涚浜屼釜姝ｆ柟浣撻渶瑕4+3脳1=7鏍圭伀鏌存锛涚涓変釜姝ｆ柟浣撻渶瑕4+3脳2=10鏍圭伀鏌存锛涒︽憜n涓姝ｆ柟褰闇4+3脳锛坣-1锛=3n+1鏍圭伀鏌存锛庡綋n=10鏃讹紝3n+1=3脳10+1=31锛屽綋3n+1=46鏃讹紝3n=45锛宯=15锛岀瓟锛氭憜10涓悓鏍风殑姝ｆ柟褰㈤渶瑕佸皬妫31鏍 鏈涢噰绾筹紒
绛旓細鎽61鏍瑰皬妫掑彲浠ユ憜锛20锛変釜姝ｆ柟褰锛岋紙61-4锛/3+1 =57/3+1 =19+1 =20锛堜釜锛
绛旓細绛旓細 1x3+1=4 2x3+1=7 3x3+1=10 浠ユ绫绘帹 n涓渶瑕3n+1鏍銆
绛旓細8鍕掞紝璋㈣阿閲囩撼
绛旓細瑙傚療绗竴涓浘寰楋紝鎼涓涓鏂瑰舰瑕佺伀鏌4鏍锛涜瀵熺浜屼釜鍥惧緱锛屾惌涓や釜姝ｆ柟褰瑕佺伀鏌达紙4+3锛夋牴锛屽嵆7鏍癸紱瑙傚療绗笁涓浘寰楋紝鎼笁涓鏂瑰舰瑕佺伀鏌达紙4+3脳2锛夋牴锛屽嵆10鏍癸紝鎵浠ユ惌a涓鏂瑰舰瑕佺伀鏌4+3脳锛坅-1锛=3a+1鏍癸紟鏁呯瓟妗堜负锛毭楋紟
绛旓細a1=4 a2=7 a3=10 ...an=4+(n-1)3=3n+1 3n+1=2005 n=668 鎵浠ユ渶澶氭惌668涓鏂瑰舰
绛旓細鐢(7)鏍瑰悓鏍烽暱鐨勫皬妫掑彲浠ユ惌2涓鏂瑰舰 3*2+1=7 鎼簲涓鏂瑰舰瑕佺敤16鏍瑰皬妫 5*3+1=16鏍
绛旓細閫氳繃褰掔撼涓庢荤粨寰楀嚭瑙勫緥锛氭鏂瑰舰姣忓鍔1锛岀伀鏌存鐨勪釜鏁板鍔3锛岀敱姝ゆ眰鍑虹n涓浘褰㈡椂闇瑕佺伀鏌寸殑鏍规暟鐨勪唬鏁板紡锛岃姹50涓牴鐏煷妫掕兘鎼姝ｆ柟褰㈢殑涓鏁帮紝鍙渶浠ｅ叆鍒楁柟绋嬫眰瑙ｅ嵆鍙紟瑙ｏ細璁炬湁n涓鏂瑰舰缁勬垚锛屽垯寰楀埌锛3n+1<50锛岃В寰楋細n<16鍙1/3锛庡嵆50鏍圭伀鏌存鎸夎繖绉嶆柟寮忔渶澶氳兘鎼16涓鏂瑰舰锛...
