2 câu trả lời
`-5/7 - (-3/4) - 1/5 - 2/7 - 1/4`
`= -5/7 + 3/4 - 1/5 - 2/7 - 1/4`
`= (-5/7 - 2/7) + (3/4 - 1/4) - 1/5`
`= -1 + 1/2 - 1/5`
`= -1/2 - 1/5`
`= -7/10`
`-5/7 - (-3)/4 - 1/5 - 2/7 - 1/4`
= `-5/7 + 3/4 - 1/5 - 2/7 - 1/4`
= `(-5/7 - 2/7) + (3/4 - 1/4) - 1/5`
= `-7/7 + 2/4 - 1/5`
= `-1 + 1/2 - 1/5`
= `-10/10 + 5/10 - 2/10`
= `-7/10`
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