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45分:3分之1小時 =45:20 =9:4 =4分之9 60克:0.8千克 =60:800 =3:40 =40分之3 80釐米:2米 =80:200 =2:5 =5分之2
0.24:8 =0.24×100:800 =24:800 =3:100 比值是100分之3
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