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" 15.If "x=(2+sqrt(5))^(3/2)+(2-sqrt(5))...

" 15.If "x=(2+sqrt(5))^(3/2)+(2-sqrt(5))^(1/2)" and "y=(2+sqrt(5))^(2/2)-(2-sqrt(5))^(2)*2" them,abw that "x^(2)+y

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