(1-Y)²=2Y(Y+1)
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(1-Y)²=2Y(Y+1)(1-Y)²=2Y(Y+1)(1-Y)²=2Y(Y+1)(1-Y)^2=2Y(Y+1)1-2Y+Y^2=2Y^2+2YY^2+4Y-1=0Y^
(1-Y)²=2Y(Y+1)
(1-Y)²=2Y(Y+1)
(1-Y)²=2Y(Y+1)
(1-Y)^2=2Y(Y+1)
1-2Y+Y^2=2Y^2+2Y
Y^2+4Y-1=0
Y^2+4Y+4=5
(Y+2)^2=5
Y+2=±√5
Y=√5-2或Y=-√5-2