3()3()3()3=10在括号内加运算符号使运算成立
3( )3( ) 3( )3( ) 3 =10\u62ec\u53f7\u586b\u4ec0\u4e48\u8fd0\u7b97\u7b26\u53f7\u9664 \u52a0 \u52a0 \u52a0
(10-6)*(9-3)*2=48
\u671b\u91c7\u7eb3
3(*)3(+)3(除以)3=10
3(*)3(+)3(/)3=10
3*3+3/3
3*3+3/3
绛旓細锛堚厾锛夎绛夊樊鏁板垪{bn}鐨勫叕宸负d锛坉鈮0锛夛紝Sn S2n 锛漦锛屽洜涓篵1=1锛屽垯n+ 1 2 n(n?1)d锛漦[2n+ 1 2 ?2n(2n?1)d]锛屽嵆2+锛坣-1锛塪=4k+2k锛2n-1锛塪锛庢暣鐞嗗緱锛岋紙4k-1锛塪n+锛2k-1锛夛紙2-d锛=0锛庡洜涓哄浠绘剰姝ｆ暣鏁皀涓婂紡鎭掓垚绔嬶紝鍒 d(4k?1)锛0 (2k?1)(2?d)锛0 锛岃В寰...
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绛旓細3*3-3/(-3)
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绛旓細涓涓涓涓暟瀛楀姞鎴栧噺鐨勭珫寮忚绠楋紝濡備笅鍥炬墍绀猴細鍐嶅啓绔栧紡鐨勮繃绋嬩腑瑕佹敞鎰忥細1銆佺浉鍚屾暟浣嶅榻愩2銆佷粠涓綅鍔犳垨鑰呭噺璧枫3銆佸摢涓浣嶄笂鐨勬暟鐩稿姞婊″崄锛屽氨瑕佸悜鍓嶄竴浣嶈繘1锛涚浉鍚屾暟浣嶅榻愶紝鑻ヤ笉澶熷噺锛屽垯鍚戝墠涓浣嶅1褰10銆
绛旓細3鍗7鐨0娆℃柟鍗5浜9锛(3鐨0娆℃柟鍗7鐨0娆℃柟)x5=10銆傝绠楃鍙锋槸璁＄畻鏁板鏃舵墍鐢ㄧ殑绗﹀彿锛岃绠楃鍙锋湁鍔犲彿銆佸噺鍙枫佷箻鍙枫侀櫎鍙枫傚姞鍑忚繍绠楁槸浜虹被鏈鏃╂帉鎻＄殑涓ょ鏁板杩愮畻 锛屼笖杞芥柤浜虹被鏈鏃╃殑鏂囧瓧璁拌浇涓備箻娉曟槸鏈鏃╀骇鐢熺殑杩愮畻涔嬩竴锛屼笖鍑虹幇浜庝汉绫绘渶鏃╃殑鏂囧瓧璁拌浇褰撲腑銆備箻娉曠殑鍩烘湰绗﹀彿鏄箻鍙封溍椻濄銆
