4 5 7 9 算24点有几种可能？（不要重复的） 4789有几种算24点的方法？

5,5,7,9\u7b97\u4e8c\u5341\u56db\u70b9\uff0c\u6709\u4ec0\u4e48\u7b97\u4e8c\u5341\u56db\u7684\u529e\u6cd5\u5417\uff1f

\u4f60\u597d\uff0c\u7b54\u6848\u662f 5 \u00d7 7 -(2 + 9)
\u529e\u6cd5\uff1a
1\uff0e\u5229\u75283\u00d78\uff1d24\u30014\u00d76\uff1d24\u6c42\u89e3\uff0e
\u628a\u724c\u9762\u4e0a\u7684\u56db\u4e2a\u6570\u60f3\u529e\u6cd5\u51d1\u62103\u548c8\u30014\u548c6\uff0c\u518d\u76f8\u4e58\u6c42\u89e3\uff0e\u59823\u30013\u30016\u300110\u53ef\u7ec4\u6210\uff0810\u20146\u00f73\uff09\u00d73\uff1d24\u7b49\uff0e\u53c8\u59822\u30013\u30013\u30017\u53ef\u7ec4\u6210\uff087\uff0b3\u20142\uff09\u00d73\uff1d24\u7b49\uff0e\u5b9e\u8df5\u8bc1\u660e\uff0c\u8fd9\u79cd\u65b9\u6cd5\u662f\u5229\u7528\u7387\u6700\u5927\u3001\u547d\u4e2d\u7387\u6700\u9ad8\u7684\u4e00\u79cd\u65b9\u6cd5\uff0e

2\uff0e\u5229\u75280\u300111\u7684\u8fd0\u7b97\u7279\u6027\u6c42\u89e3\uff0e
\u59823\u30014\u30014\u30018\u53ef\u7ec4\u62103\u00d78\uff0b4\u20144\uff1d24\u7b49\uff0e\u53c8\u59824\u30015\u3001J\u3001K\u53ef\u7ec4\u621011\u00d7\uff085\u20144\uff09\uff0b13\uff1d24\u7b49\uff0e

3\uff0e\u5728\u6709\u89e3\u7684\u724c\u7ec4\u4e2d\uff0c\u7528\u5f97\u6700\u4e3a\u5e7f\u6cdb\u7684\u662f\u4ee5\u4e0b\u516d\u79cd\u89e3\u6cd5\uff1a\uff08\u6211\u4eec\u7528a\u3001b\u3001c\u3001d\u8868\u793a\u724c\u9762\u4e0a\u7684\u56db\u4e2a\u6570\uff09
\u2460(a\u2014b\uff09\u00d7\uff08c\uff0bd\uff09 \u5982\uff0810\u20144\uff09\u00d7\uff082\uff0b2\uff09\uff1d24\u7b49\uff0e
\u2461\uff08a\uff0bb\uff09\u00f7c\u00d7d \u5982\uff0810\uff0b2\uff09\u00f72\u00d74\uff1d24\u7b49\uff0e
\u2462\uff08a\uff0db\u00f7c\uff09\u00d7d \u5982\uff083\u20142\u00f72\uff09\u00d712\uff1d24\u7b49\uff0e
\u2463\uff08a\uff0bb\uff0dc\uff09\u00d7d \u5982\uff089\uff0b5\u20142\uff09\u00d72\uff1d24\u7b49\uff0e
\u2464a\u00d7b\uff0bc\u2014d \u598211\u00d73\uff0bl\u201410\uff1d24\u7b49\uff0e
\u2465\uff08a\uff0db\uff09\u00d7c\uff0bd \u5982\uff084\u2014l\uff09\u00d76\uff0b6\uff1d24\u7b49\uff0e
\u5e0c\u671b\u5bf9\u4f60\u6709\u5e2e\u52a9

8\u00d79\u00f7(7\uff0d4)\uff1d24
(8\uff0b7\uff0d9)\u00d74\uff1d24
(8\uff0b4)\u00d7(9\uff0d7)\uff1d24

5×(7-4)+9=24
4×9-(5+7)=24
4×7-(9-5)=24

1. 7*(9-5)-4=24
2. 5*(7-4)+9=24
3. 4*9-7-5=24

4×9－（5+7）＝24

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