来自林莘的问题
【3()3()3()3=1填运算符号加减乘除括号.3()3()3()3=13()3()3()3=23()3()3()3=33()3()3()3=43()3()3()3=5】
3()3()3()3=1填运算符号加减乘除括号.
3()3()3()3=1
3()3()3()3=2
3()3()3()3=3
3()3()3()3=4
3()3()3()3=5
3*3/3/3=1
3/3+3/3=2
(3-3)*3+3=3
(3*3+3)/3=4
3-3/3+3=5
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