1/3:4/5=(1/3×15):(4/5×15)=5:12 3/7:5/21=(3/7×21):(5/21×21)=9:5 4/15:4/25=4/15÷4/25=5/3=5:3 0.32:0.8=(0.32÷0.08):(0.8÷0.08)=4:10=2/5 1:0.25=1:1/4=4:1 1.35:9.25=135:925=27:185
5比12 9比5 5比3 2比5 4:1 27:185
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