2 câu trả lời
`- ( - 3/4 ) - ( 2/3 + 1/4 )`
`= 3/4 - ( 2/3 + 1/4 )`
`= 3/4 - 2/3 - 1/4`
`= 3/4 - 1/4 - 2/3`
`= 1/2 - 2/3`
`= 3/6 - 4/6`
`= ( - 1 )/6`
Đáp án:
$\dfrac{-1}6$
Giải thích các bước giải:
$-\dfrac{-3}4-\left(\dfrac23+\dfrac14\right)\\=\dfrac34-\dfrac23-\dfrac14\\=\dfrac{3-1}4-\dfrac23\\=\dfrac12-\dfrac23\\=\dfrac{-1}6$