-1 +2 -3 +4 +5 -6 +7 -8=0
+1 -2 +3 -4 -5 +6 -7 +8=0
+1 +2 -3 -4 -5 -6 +7 +8=0
-1 -2 +3 +4 +5 +6 -7 -8=0
在数1,2,3,4,5,6,7,8,的前面分别加上"正号"或"负号",使它们的和为0
在数1,2,3,4,5,6,7,8,的前面分别加上"正号"或"负号",使它们的和为0
数学人气：193 ℃时间：2019-10-19 07:02:43
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