{60-(9.5+( ))}÷0.18=120 (括号里填什么)

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{60-(9.5+( ))}÷0.18=120 (括号里填什么)
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{60-(9.5+( ))}÷0.18=120 (括号里填什么)
{60-(9.5+( ))}÷0.18=120 (括号里填什么)

{60-(9.5+( ))}÷0.18=120 (括号里填什么)
{60-(9.5+( x))}÷0.18=120
60-(9.5+x)=21.6
9.5+x=60-21.6
x=38.4-9.5
x=28.9
括号里填28.9