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2/5∶1/4=2×4/5×4:1×5/4×5=4/20:5/20=4:5=4/5 1/20∶1/4=1/20:1×5/4×5=1/20:5/20=1:5=1/5 0.25∶1=1/4:1=1/4:4/4=1:4=1/4 48/32=48÷16/32÷16=3/2=1又1/2
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