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6.4 vs. 0.8
6.4x10:0.8x10
64:8
8:1
How to simplify 0.4 to 1.8
2: reduction ratio
24:8/3
=(24*3):(8/3*3)
=72:8
=(72÷8)：（8÷8）
=9:1
0.2:4/5
=(1/5*5):(4/5*5)
=1:4
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