18.03+5.46+( )=29.3

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18.03+5.46+( )=29.3
18.03+5.46+( )=29.3

18.03+5.46+( )=29.3
18.03+5.46+(5.81 )=29.3

5、81

29.3-18.03-5.46=5.81
s所以18.03+5.46+(5.81)=29.3