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NNNLLL54

2); ; y=sqrt{x^2-4x+3}+sqrt{2x^2-18}\\OOF:; ; left { {{x^2-4x+3geq 0} atop {2x^2-18geq 2}} right. ; left { {{(x-1)(x-3)geq 0} atop {2(x-3)(x+3)geq 0}} right.; left { {{xin (-infty ,1, ]cup [, 3,+infty )} atop {xin (-infty ,-3, ]cup [, 3,+infty )}} right. ; ; ; Rightarrow \\xin (-infty -3, ]cup {1}cup [3, +infty )

4); ; y=sqrt{5x^2-4x-12}+sqrt{25-x^2}\\OOF:; ; left { {{5x2-4x-12geq 0} atop {25-x^2geq 0}} right.; left { {{5(x-2)(x+frac{6}{5})geq 0} atop {(5-x)(5+x)geq 0}} right.; left { {{xin (-infty ,-frac{6}{5}, ]cup [, 2,+infty )} atop {xin [-5,5, ]}} right.; ; Rightarrow \\xin [-5, -frac{6}{5}, ]cup [, 2,5, ]

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