Tham khảo:

Câu ` 1: `

` d) -(4 1/2 - 1/2) + 5 3/4 - 3/4 : 3/4 `

` = -4 + 5 3/4 - 3/4 : 3/4 `

` = -4 + 5 3/4 - 1 `

` = 1 3/4 - 1 `

` = 3/4 `

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Câu ` 2: `

` a) x - 7/3 = (-5)/6 `

` <=> x = (-5)/6 + 7/3 `

` <=> x = 3/2 `

Vậy ` x = 3/2 `

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` b) (x - 12)/8 = (-5)/4 `

` <=> (x - 12)/8 = (-10)/8 `

` <=> x - 12 = (-10) `

` <=> x = 2 `

Vậy ` x = 2 `

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` c) 3/4 + 1/4x = 0,3 `

` <=> 3/4 + 1/4x = 3/10 `

` <=> 1/4x = 3/10 - 3/4 `

` <=> 1/4x = (-9)/20 `

` <=> x = (-9)/20 : 1/4 `

` <=> x = (-9)/5 `

Vậy ` x = (-9)/5 `