1 / 12: 3.6 first simplify, then calculate the ratio

Simplification
1 / 12: 3.6
=1 in 12: 18 in 5
=5 ：216
Ratio
1 / 12: 3.6
=1 / 12 △ 3.6
=1 / 12 ／ 18 / 5
=5 / 216

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