五个5，中间用加减乘除，只能用一次，最后等于20，怎么算
5\u4e2a5 \u4e2d\u95f4\u7528\u52a0\u51cf\u4e58\u9664\u5404\u4e00\u6b21 \u600e\u6837\u624d\u80fd\u7b97\u5230\u7b49\u4e8e205\u00d75-(5\u00f75)\u00d75=20
\u3010\u5b66\u4e60\u5b9d\u5178\u3011\u56e2\u961f\u4e3a\u60a8\u7b54\u9898\u3002\u6709\u4e0d\u660e\u767d\u7684\u53ef\u4ee5\u8ffd\u95ee\uff01
7
\u548c
19
\u7528\u4e86\u4e00\u6b21\u6839\u53f7\uff0c\u5176\u4f59\u7684\u90fd\u53ea\u7528\u4e86
+\uff0c-\uff0c\u00d7\uff0c\u00f7\uff0c()
1
=
(4-4)\u00d74+4\u00f74
2
=
(4+4)\u00f74+4-4
3
=
4-4+4-4\u00f74
4
=
4-4+4-4+4
5
=
4-4+4+4\u00f74
6
=
4+4\u00f74+4\u00f74
7
=
4\u00f74+4+4-\u221a4
\uff1f\uff1f\uff1f
8
=
4+4+(4-4)\u00d74
9
=
(4+4\u00d74)\u00f74+4
10
=
(4+4)\u00f74+4+4
11
=
4+4+4-4\u00f74
12
=
4+4+4+4-4
13
=
4\u00d74-4+4\u00f74
14
=
4\u00d74-(4+4)\u00f74
15
=
(4\u00d74\u00d74-4)\u00f74
16
=
(4+4\u00f74)\u00d74-4
17
=
(4\u00d74\u00d74+4)\u00f74
18
=
4\u00d74+(4+4)\u00f74
19
=
4\u00d74+\u221a4+4\u00f74
\uff1f\uff1f\uff1f
20
=
4+4+4+4+4
\u6709\u4e9b\u6570\u4e0d\u6b62\u4e00\u79cd\u7b97\u6cd5\uff0c\u6bd4\u5982\uff1a4,
20
\u7b49\uff0c\u8fd9\u91cc\u4e0d\u518d\u5217\u4e3e\u4e86
没有说必须全用
-（5÷5）×5＋5×5=20
(5÷5）×5＋5×5=20 全用了哈
绛旓細5X5-5*5+5=29 5*5X5-5+5=5 5-5X5+5*5=-21 5+5*5X5-5=5 5X5-5+5*5=19 5*5X5+5-5=5 5-5X5*5+5=5 5=5*5-5X5=-19 鍥涗釜绗﹀彿锛屼簩鍗佸洓绉嶇畻娉曪紝鏃犺В锛堟棤鎷彿锛
绛旓細5*[5-5/(5*5)]=24 (5*5*5-5)/5=24
绛旓細閫傚悎灏忓涓夊勾绾х殑瀛︾敓鏂规硶锛氾紙5*5*5锛5锛壝5锛濓紙125锛5锛壝5锛120梅5锛24 閫傚悎灏忓浜斻佸叚骞寸骇瀛︾敓鐨勬柟娉曡繕鏈夛細锛5锛5梅5梅5锛*5锛濓紙5锛1梅5锛*5锛24/5*5锛24
绛旓細5*(5-5梅5梅5)=24
绛旓細[5锛+(5-5)*5]/5=(120+0)/5=24 鍡紝娌℃湁閲嶅锛屾病璇翠笉鑳界敤闃朵箻鍢泘~
绛旓細浜斾釜浜鐢ㄥ姞鍑忎箻闄涔嬪悗绛変簬5
绛旓細1: 5 脳 (5 - 5 梅5梅 5) =5*4.8=24 2: 5 脳 (5 - (5梅5 梅 5))=5*(5-0.2)=24
绛旓細5x[5-锛5梅5锛/5]=5x[5-1/5]=5x[25/5-1/5]=5x24/5=24
绛旓細锛5脳5脳5锛5锛壝5锛24 [5-(5梅5)梅5]脳5=24 5梅5=1 1梅5=0.2 5-0.2=4.8 4.8脳5=24 5脳5+銆(-5梅5)銆曞悗闈㈡槸5娆℃柟 锛屻斾笉鐭ラ亾濡備綍鎵5娆℃柟銆曪季锛嶏季 5脳5=25,-5梅5=-1,-1鐨5娆℃柟=-1 25+(-1)=24
绛旓細(5*5)-(5+5+5)=10
