Đáp án: Hòa `>` Mai
Giải thích các bước giải:
Ta có: `1/4 = {1xx7}/{4xx7} = 7/28`
`2/7 = {2xx4}/{7xx4} = 8/28`
Vì `8/28 > 7/28`
Nên Hòa `>` Mai
Vân tặng Mai : `1/4` số hoa
Vân tặng Hòa : `2/7`
`=> 1/4` và `2/7 = 7/28 < 8/28`
Do đó `2/7 > 1/4`
Vậy Hòa được tặng nhiều hơn.
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