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常用的分数小数百分数互化鼓励孩子背熟1/2=0.5=50% 1/4=0.25=25% 3/4=0.75=75%1/5=0.2=20% 2/5=0.4=40% 3/5=0.6=60%4/5=0.8=80% 1/8=0.125=12.5%3/8=0.375=37.5% 5/8=0.625=62.5%7/8=0.875=87.5% 1/20=0.01/20=0.05=5%1/25=0.04=4% 1/60.167=16.7%5/60.833=83.3% 1/90.111=11.1%1/30.333=33.3% 2/30/66766.7%,