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1/3:0.25=1/3:1/4=(1/3)*12:(1/4)*12=4:3 0.8:1又7/5=4/5:12/5=(4/5)*5:(12/5)*5=4:12=1:3 3/4:1.25=3/4:5/4=(3/4)*4:(5/4)*4=3:5 3:4/7=(3*7):(4/7)*7=21:4
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