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84:162=2x2x3x7:2x3x3x9=2x7:3x9=14:27 2分之1:8分之1=8x2分之1:8x8分之1=4:1 4分之3:12分之7=12x4分之3:12x12分之7=9:7 5分之1:20分之1=20x5分之1:20x20分之1=4:1
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