():20=2:()=0.2=50/()=百分之几

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():20=2:()=0.2=50/()=百分之几

():20=2:()=0.2=50/()=百分之几
():20=2:()=0.2=50/()=百分之几

():20=2:()=0.2=50/()=百分之几
(4):20=2:(10)=0.2=50/(250)=百分之20