问题标题：
【填运算符号.3()3()3()3=13()3()3()3=23()3()3()3=33()3()3()3=8】
问题描述：
填运算符号.
3()3()3()3=1
3()3()3()3=2
3()3()3()3=3
3()3()3()3=8
邵伟民回答：
3(x)3(÷)3(÷)3=1
3(÷)3(+)3(÷)3=2
3(x)3(-)3(-)3=3
3(x)3(-)3(÷)3=8
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