Câu 1:
`a, = m - 3 - 2m`
`= -m - 3`
`b, sqrt((45mn^2)/(20m)) = sqrt((9n^2)/5) = n sqrt(9/5)`
`c, = x - x + 1`
`= 1`
`d, = (x+3)/((x-3)(x+3))`
`= 1/(x-3)`
`e, = sqrt m - sqrt m + 1`
`= 1`
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