()千克比2千克少4分之1,()千克比20千克少4分之1千克?

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()千克比2千克少4分之1,()千克比20千克少4分之1千克?()千克比2千克少4分之1,()千克比20千克少4分之1千克?()千克比2千克少4分之1,()千克比20千克少4分之1千克?(1.5)千克

()千克比2千克少4分之1,()千克比20千克少4分之1千克?
()千克比2千克少4分之1,()千克比20千克少4分之1千克?

()千克比2千克少4分之1,()千克比20千克少4分之1千克?
(1.5)千克比2千克少4分之1,(15)千克比20千克少4分之1千克

2×(1-1/4)=1.5
20×(1-1/4)=15