设有长度为1,2,3,4,5,6,7,8,9的木棒若干条,从这些木棒中选取三条组成一个三角形,共有多少种不同的方法? 有长度1,2,3,4,5,6,7,8,9,0,11的木棒足够...
\u957f\u5ea61\uff0c2\uff0c3\uff0c 4,5,6,78\uff0c9\u7684\u6728\u68d2\u5404\u4e00\u6839\uff0c\u4e0d\u80fd\u6298\u65ad\u4ece\u4e2d\u9009\u82e5\u5e72\u6839\u7ec4\u6210\u6b63\u65b9\u5f62\uff0c\u6709\u51e0\u79cd\u4e0d\u540c\u65b9\u6cd5\uff1f\u65b9\u6848\u51719\u4e2a
\u8fb9\u957f11\u65f6\uff0c9+2\u3001 8+3 \u30017+4, 6+5 1\u79cd
\u8fb9\u957f10\u65f6\uff0c9+1,8+2,7+3,6+4 1\u79cd
\u8fb9\u957f9\u65f6\uff0c9+0,1+8\uff0c2+7,3+6,5+4\uff0c\u6ce8\u610f\u4e86\u8fd9\u91cc\u67095\u79cd
\u8fb9\u957f8\u65f6\uff0c8\uff0c7+1\uff0c6+2\uff0c5+3 1\u79cd
\u8fb9\u957f7\u65f6\uff0c7\uff0c6+1\uff0c5+2\uff0c4+3 1\u79cd
\u51719\u79cd\u65b9\u6cd5
7\u79cd
\u56e0\u4e3a\u5468\u957f\u662f15\uff0c\u6240\u4ee5\u6700\u957f\u7684\u4e00\u8fb9\u4e0d\u8d85\u8fc77\uff08\u4e24\u8fb9\u4e4b\u548c\u5927\u4e8e\u7b2c\u4e09\u8fb9\uff09\uff0c\u6700\u77ed\u7684\u4e00\u8fb9\u4e0d\u5927\u4e8e5\uff08\u5f53\u6700\u77ed\u7684\u4e00\u8fb9\u5927\u4e8e5\u65f6\uff0c\u4e09\u8fb9\u548c\u5927\u4e8e15\uff09
\u6700\u77ed\u7684\u4e00\u8fb9\u662f1\u65f6\u6709\u4e00\u79cd\uff1a 1.7.7
\u6700\u77ed\u7684\u4e00\u8fb9\u662f2\u65f6\u6709\u4e00\u79cd\uff1a 2.6.7
\u6700\u77ed\u7684\u4e00\u8fb9\u662f3\u65f6\u6709\u4e8c\u79cd\uff1a 3.6.6 3.5.7
\u6700\u77ed\u7684\u4e00\u8fb9\u662f4\u65f6\u6709\u4e8c\u79cd\uff1a 4.5.6 4.4.7
\u6700\u77ed\u7684\u4e00\u8fb9\u662f5\u65f6\u6709\u4e00\u79cd\uff1a 5.5.5
\u6240\u4ee5\u4e00\u5171\u67097\u79cd
111,122,133,144,155,166,177,188,199
222,223,233,234,244,245,255,256,266,267,277,278,288,289,299
333,,334,335,344,345,346,355,356,357,366,367,368,377,378,379,388,389,399
444,445,446,447,455,456,457,458,466,467,468,469,477,478,479,488,489,499
555,556,557,558,559,566,567,568,569,577,578,579,588,589,599
666,667,668,669,677,678,679.,688,689,699
777,778,779,788,789,799
888,889,899
999
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绛旓細95绉嶏紝濡備笅锛111锛122锛133锛144锛155锛166锛177锛188锛199 222锛223锛233锛234锛244锛245锛255锛256锛266锛267锛277锛278锛288锛289锛299 333,锛334锛335锛344锛345锛346锛355锛356锛357锛366锛367锛368锛377锛378锛379锛388锛389锛399 444锛445锛446锛447锛455锛456锛457锛458锛466锛467锛...
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绛旓細2,3,4 3,4,5 2,4,5 3/10
绛旓細1+2+3+鈥+8=36锛屾晠姝f柟褰㈢殑杈归暱鏈澶氫负9鍘樼背锛岃岀粍鎴愮殑姝f柟褰㈤渶瑕4涓竟闀匡紝鏁呰竟闀挎渶灏忎负7锛7=1+6=2+5=3+4锛8=1+7=2+6=3+5锛1+8=2+7=3+6=4+5锛屾晠杈归暱涓7銆8銆9鐨勬鏂瑰舰鍚涓涓紝鍏3涓紝绛旓細鏈3绉嶄笉鍚岀殑鏂规硶缁勬垚姝f柟褰紟鏁呯瓟妗堜负锛3锛
绛旓細鈶2鍘樼背锛3鍘樼背锛4鍘樼背锛涒憽3鍘樼背锛4鍘樼背锛5鍘樼背锛涒憿2鍘樼背锛4鍘樼背锛5鍘樼背锛涚瓟锛涓鍏卞彲浠ユ嫾鎴3涓笁瑙掑舰锛庢晠閫夛細B锛
绛旓細12. 鐢变笁瑙掑舰鐨勪竴杈逛负11鍘樼背,鍙婂叾浠栬竟闀垮繀涓1,2,.鈥︼紝11鍘樼背锛屾牴鎹笁瑙掑舰涓よ竟涔嬪拰澶т簬绗笁杈圭殑鎬ц川锛屽彲鐭ヤ袱杈逛箣鍜屽簲浠嬩簬12鍘樼背鍜22鍘樼背涔嬮棿锛堝寘鍚12鍘樼背鍜22鍘樼背锛.杩欐牱,鍏卞彲鍥存垚36涓笉鍚岀殑涓夎褰.12:(1,11),(2,10),(3,9),(4,8),(5,7),(6,6)锛13:(2,11),(3,10),(4,9)...
绛旓細浣嗗鏋滄槸瀛楃鏁扮粍 char a[5] 铏界劧涔熷彲浠ュ瓨鏀5 涓瓧绗︼紝浣嗘槸閫氬父鍙瓨鏀4涓紝鏈鍚1涓瓧绗︽斁鐨勫氨鏄粨鏉熺鍙封榎0鈥欎綘闂负浠涔堥渶瑕佺粨鏉熺鍙枫傚洜涓轰笌瀛楃鏁扮粍鐩稿叧鍑芥暟鍒ゆ柇瀛楃涓闀垮害閮芥槸閫氳繃杩欎釜缁撴潫绗﹀彿鍒ゆ柇鐨勩傛瘮濡傦細杩欐牱涓涓瓧绗︿覆鈥渁bcde\0鈥 浣犱娇鐢ㄥ嚱鏁皊trlen鑾峰彇鍏堕暱搴︽椂鍊欙紝寰楀埌鐨勫氨鏄鍏冪礌鍒扮涓...
绛旓細璁緄nt a[3][4]={1,2,3,4,5,6};锛屽涓1鐨勬暟缁勫厓绱犳槸锛堛锛夈侫.a[0][0]B.a[0][1]C.a[1][0]D.a[1][1]鏌ョ湅绛旀瑙f瀽 銆愭纭瓟妗堛 A 銆愮瓟妗堣В鏋愩 浜岀淮鏁扮粍a[3][4]鍙互鐪嬫垚鏄3涓闀垮害涓4鐨勪竴缁存暟缁勶紝涓嬫爣浠嶽0][0]寮濮嬨傚弬瑙佹暀鏉怭109銆傛湰棰樼煡璇嗙偣锛氫簩缁存暟缁,