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9.5-(3.6+3.5) =9.5-3.6-3.5 =9.5-3.5-3.6 =6-3.6 =2.4
(1000-1)*99.9=1000*99.9-1*99.9=99900-99.9=99800.1
原式=3-(5/9+4/9)=3-1=2
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