+[-(+1.如题

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+[-(+1.如题+[-(+1.如题+[-(+1.如题+[-(+1.5)]=+[-1.5]=-1.5

+[-(+1.如题
+[-(+1.如题

+[-(+1.如题
+[-(+1.5)] = +[-1.5] =-1.5