X+Y=1/8.XY=1.5求X,Y
问题描述：
X+Y=1/8.XY=1.5求X,Y
答
y = 1/8 - x;
x(1/8 - x) = 1.5;
x^2 - 0.125x + 1.5 = 0；
x = 0.125 ± (-5.984375)^0.5
= 0.125 ± i(383^0.5)/8
∴
x = 0.125 + i(383^0.5)/8
y = - i(383^0.5)/8
或
x = 0.125 - i(383^0.5)/8
y = + i(383^0.5)/8