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除以2 4/5÷2=2/5 2/5÷2=1/5 1/5÷2=1/10 1/10÷2=1/20 1/20÷2=1/40 1/40÷2=1/80 5分之4,5分之2,5分之1,(1/10),20分之1,(1/40),(1/80)
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