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y = 1 - √3
x - y = 2 + √3 - 1 + √3 = 1 + 23
x * y = (2 + √3)(1 - √3) = 2 + √3 - 2√3 - 3 = - 1 - 3 = - (1 + √3)
x² = (2 + √3)² = 4 + 4√3 + 3 = 7 + 4√3
x/y = (2 + √3)/(1 - √3) = (2 + √3)(1 +√3)/(1 - √3)(1 + √3) = - (1 + √3)/1 - 3) =
= -(1 + √3)/- 2 = (1 + √3)/2