求比值.15:5= 1.4:2.1= 3/8:1/2=

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求比值.15:5= 1.4:2.1= 3/8:1/2=
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求比值.15:5= 1.4:2.1= 3/8:1/2=
求比值.15:5= 1.4:2.1= 3/8:1/2=

求比值.15:5= 1.4:2.1= 3/8:1/2=
15:5=3;
1.4:2.1= 2:3;
3/8:1/2=3:4;
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3:1很简单啊
还有很多呢