√27-√75+√243 = √(9*3) - √(25*3) + √(81*3) = 3√3 - 5√3 + 9√3 = 7√3.
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√27-√75+√243 = √(9*3) - √(25*3) + √(81*3) = 3√3 - 5√3 + 9√3 = 7√3.