`MSC:36`
`5/12=(5xx3)/(12xx3)=15/36`
`4/9=(4xx4)/(9xx4)=16/36`
`-> 5/12 < 4/9`
`----`
`MSC:60`
`7/60` giữ nguyên
`1/5=(1xx12)/(5xx12)=12/60`
`->7/60<1/5`
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