Произведение каких чисел дает 0.25, а сумму 1.8?

[latex] \left \{ {{xy=0,25} \atop {x+y = 1,8}} \right. \\\\ \left \{ {{xy=0,25} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{x(1,8 - x)=0,25} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{1,8x - x^2=0,25} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{- x^2 + 1,8x -0,25 = 0} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{ x^2 - 1,8x + 0,25 = 0} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{ X_{1,2} = \cfrac {1,8 \pm \sqrt{3, 24 - 1}}{2}} \atop {y = 1,8 - x}} \right. \\\\ [/latex] [latex] \left \{ {{ X_{1,2} = \cfrac {1,8 \pm \sqrt{3, 24 - 1}}{2}} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{ X_{1,2} = \cfrac {1,8 \pm \sqrt{2, 24}}{2}} \atop {y = 1,8 - x}} \right. \\\\ \left \{ {{ X_{1,2} = \cfrac {1,8 \pm \sqrt{2, 24}}{2}} \atop {y_{1,2} = 1,8 - \cfrac{1,8 \pm \sqrt{2, 24}}{2}}} \right. \\\\[/latex] [latex]\left \{ {{ X_{1,2} = \cfrac {1,8 \pm \sqrt{2, 24}}{2}} \atop {Y_{1,2} = \cfrac{1,8 \mp \sqrt{2, 24}}{2}}} \right. \\\\[/latex] Ответ: [latex]\cfrac {1,8 + \sqrt{2, 24}}{2}} [/latex] и [latex]\cfrac {1,8 - \sqrt{2, 24}}{2}} [/latex] или  [latex]\cfrac {1,8 - \sqrt{2, 24}}{2}} [/latex] и [latex]\cfrac {1,8 +\sqrt{2, 24}}{2}} [/latex] что по сути то же самое