既是三的倍数有是五的倍数有什么
\u65e2\u662f2,3\u7684\u500d\u6570\u53c8\u662f5\u7684\u500d\u6570\u6709\u54ea\u4e9b\uff1f2\u7684\u500d\u6570\u662f 2n\uff0c3\u7684\u500d\u6570\u662f 3n\uff0c5\u7684\u500d\u6570\u662f 5n
3\u4e2a\u90fd\u662f\u8d28\u6570\uff0c\u4e0d\u53ef\u7ea6
\u540c\u65f6\u6ee1\u8db3\u6761\u4ef6\u7684\u8bdd\u5c31\u662f (2*3*5)*n\uff0c\u5c31\u662f 30, 60, ...
\u4e0d\u5bf9\uff0c\u56e0\u4e3a15\u662f5\u7684\u500d\u6570\uff0c\u540c\u6837\uff0c15\u4e5f\u662f3\u7684\u500d\u6570\u3002
1\u30013\u7684\u500d\u6570\u7279\u5f81\uff1a
\u4e00\u4e2a\u6570\u7684\u5404\u4f4d\u6570\u4e4b\u548c\u662f3\u7684\u500d\u6570\uff0c\u8fd9\u4e2a\u6570\u5c31\u662f3\u7684\u500d\u6570\u3002
4926\u3002(4+9+2+6)\u00f73=7\uff0c\u662f3\u7684\u500d\u6570\u30024926\u00f73=1642
2\u30015\u7684\u500d\u6570\u7279\u5f81\uff1a
\u4e00\u4e2a\u6570\u7684\u672b\u5c3e\u662f0\u62165\uff0c\u8fd9\u4e2a\u6570\u5c31\u662f5\u7684\u500d\u6570\u3002
7775\u30027775\u7684\u672b\u5c3e\u4e3a5\u30027775\u00f75=1555
\u6269\u5c55\u8d44\u6599\uff1a
\u4e00\u3001\u516c\u500d\u6570
\u5b9a\u4e49\uff1a\u4e24\u4e2a\u6216\u591a\u4e2a\u6574\u6570\u516c\u6709\u7684\u500d\u6570\u53eb\u505a\u5b83\u4eec\u7684\u516c\u500d\u6570\u3002
\u4e24\u4e2a\u6216\u591a\u4e2a\u6574\u6570\u7684\u516c\u500d\u6570\u91cc\u6700\u5c0f\u7684\u90a3\u4e00\u4e2a\u53eb\u505a\u5b83\u4eec\u7684\u6700\u5c0f\u516c\u500d\u6570\u3002
\u4e8c\u3001\u500d\u6570\u89c4\u5f8b
\u4efb\u610f\u4e24\u4e2a\u5947\u6570\u7684\u5e73\u65b9\u5dee\u662f8\u7684\u500d\u6570
\u8bc1\u660e\uff1a\u8bbe\u4efb\u610f\u5947\u65702n+1,2m+1,(m,n\u2208N)
\uff082m+1)2-(2n+1)2
=(2m+1+2n+1)*(2m-2n)
=4(m+n+1)(m-n)
\u5f53m,n\u90fd\u662f\u5947\u6570\u6216\u90fd\u662f\u5076\u6570\u65f6\uff0cm-n\u662f\u5076\u6570\uff0c\u88ab2\u6574\u9664
\u5f53m,n\u4e00\u5947\u4e00\u5076\u65f6\uff0cm+n+1\u662f\u5076\u6570\uff0c\u88ab2\u6574\u9664
\u6240\u4ee5(m+n+1)(m-n)\u662f2\u7684\u500d\u6570
\u52194(m+n+1)(m-n)\u4e00\u5b9a\u662f8\u7684\u500d\u6570
\uff08\u6ce8\uff1a0\u53ef\u4ee5\u88ab2\u6574\u9664\uff0c\u6240\u4ee50\u662f\u4e00\u4e2a\u5076\u6570\uff0c0\u4e5f\u53ef\u4ee5\u88ab8\u6574\u9664\uff0c\u6240\u4ee50\u662f8\u7684\u500d\u6570\u3002\uff09
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1\uff0d\u500d\u6570
15 30 45 60 75 之类，加15
3和5的公倍数 15 30 45 60.......
有无数个 100以下的是15 30 45 60 75 90
只要是15的倍数就都是，有无数个
绛旓細15.30.45.60銆傘備互姝ょ被鎺紝姣忎笅涓涓姞15
绛旓細鏃㈡槸3鐨勫嶆暟鍙堟槸5鐨勫嶆暟鐨勬暟鏈夛細15銆30銆45銆60銆75銆90锛岃В閲婂涓嬶細1銆佹垜浠渶瑕佺悊瑙ｄ粈涔堟槸3鐨勫嶆暟鍜5鐨勫嶆暟銆備竴涓暟鏄3鐨勫嶆暟锛屾剰鍛崇潃杩欎釜鏁板彲浠ヨ3鏁撮櫎锛屽嵆杩欎釜鏁伴櫎浠3鐨勪綑鏁颁负0銆傚悓鏍峰湴锛屼竴涓暟鏄5鐨勫嶆暟锛屾剰鍛崇潃杩欎釜鏁板彲浠ヨ5鏁撮櫎锛屽嵆杩欎釜鏁伴櫎浠5鐨勪綑鏁颁负0銆2銆15锛15鍙互琚3鏁撮櫎锛屽洜涓...
绛旓細鏃㈡槸3鐨勫嶆暟鍙堟槸5鐨勫嶆暟鏈夋棤鏁颁釜锛姣斿锛15銆30銆45銆60銆75銆90銆105绛夌瓑绛夌瓑銆傚鏋滀笉鍔犺寖鍥达紝鍙绗﹀悎3銆5鐨勫嶆暟鐨勭壒寰佺殑鏁帮紝閮芥槸3鍜5鐨勫嶆暟锛屾渶灏忔槸15銆3銆5鐨勫嶆暟鐨勭壒寰侊細涓綅涓婃槸0鎴5鐨勬暟锛屽悇涓暟浣嶄笂鐨勬暟瀛楃浉鍔犱箣鍜屾槸3鐨勫嶆暟銆3鐨勫嶆暟锛氫竴涓暟鐨勫悇浣嶆暟涔嬪拰鏄3鐨勫嶆暟锛岃繖涓暟灏辨槸...
绛旓細鏃㈡槸3鐨勫嶆暟锛屽張鏄5鐨勫嶆暟鐨勪釜鏁版湁 15,30,45,60,75,90鈥︹︽瘡闅15涓兘鏄
绛旓細鏃㈡槸涓夌殑鍊嶆暟涔熸槸浜旂殑鍊嶆暟鐨勬暟鏈夋棤鏁颁釜锛濡15銆30銆45銆60銆75銆90绛夌瓑銆傛棦鏄笁鐨勫嶆暟涔熸槸浜旂殑鍊嶆暟璇存槑杩欎釜鏁版槸3銆5鐨勫叕鍊嶆暟锛岀畻娉曚负3脳5=15锛屾墍浠15鏄3銆5鐨勬渶灏忓叕鍊嶆暟锛屾墍鏈15鐨勫嶆暟閮芥槸3銆5鐨勫叕鍊嶆暟銆
绛旓細鏃㈡槸3鐨勫嶆暟鍙堟槸5鐨勫嶆暟鏈夋棤鏁颁釜锛屾瘮濡傦細15銆30銆45銆60銆75銆90銆105绛锛屽畠浠殑鏈灏忓叕鍊嶆暟鏄15锛屽嶆暟鏄寚涓涓暟鍜屼竴鏁存暟鐨勪箻绉備竴涓暣鏁拌兘澶熻鍙︿竴涓暣鏁版暣闄わ紝杩欎釜鏁存暟灏辨槸鍙︿竴鏁存暟鐨勫嶆暟锛屽15鑳藉琚3鎴5鏁撮櫎锛屽洜姝15鏄3鐨勫嶆暟锛屼篃鏄5鐨勫嶆暟銆
绛旓細鏃㈡槸涓夌殑鍊嶆暟鍙堟槸浜旂殑鍊嶆暟鐨勬暟鏈夋棤鏁颁釜锛濡:15銆30銆45銆60銆75銆90鈥﹀彧瑕佺敤涓夊拰浜旂殑鏈灏忓叕鍊嶆暟15(3脳5=15)鍒嗗埆鍘讳箻1銆2銆3銆4銆5銆6鈥﹀嵆鍙緱鍒般
绛旓細鍦1~20涓,3鐨勫嶆暟鏈(3锛6锛9锛12锛15锛18),5鐨勫嶆暟鏈(5锛10锛15锛20),鏃㈡槸3鐨勫嶆暟鍙鏄5鐨勫嶆暟鏈(15).
绛旓細涓夌殑鍊嶆暟鏈:6锛9锛12锛15锛屸︹3n (n鏄嚜鐒舵暟)銆浜旂殑鍊嶅嶆暟:5锛10锛15锛20锛屸︹5n(n鏄嚜鐒舵暟)銆
绛旓細鏃㈡槸浜岀殑鍊嶆暟鍙鏄簲鐨勫嶆暟10銆20銆30鈥︹︼紙鏃犳暟涓級锛屽彧瑕佹槸鏁村崄鏁版棦鏄簩鐨勫嶆暟鍙堟槸浜旂殑鍊嶆暟銆5鐨勫嶆暟闄や簡瀹冩湰韬涓綅涓婇兘鏄0鎴栬5,2鐨勫嶆暟閮芥槸鍋舵暟,鎵浠ユ棦鏄2鐨勫嶆暟鍙鏄5鐨勫嶆暟鐨勬暟蹇呭畾鏄釜浣嶄笂涓0鐨勪袱浣嶆暟鎴栧浣嶆暟銆
