100(1-x)的平方=81
(1-x)的平方=0.81
1-x=0.9或1-x=-0.9
x1=0.1,x2=-1.9。 希望帮到你!望采纳,谢谢!~
100 ( 1-x)^2 = 81
==> (1-x)^2 = 81/100
==> (1-x)^2 = 0.81
==> 1-x = ±0.9
==> x = 1 ±0.9
==> x = 1.9, 0.1
(x-1)�0�5=(9/10)�0�5 x-1=9/10 x=19/10;或 x-1=-9/10 x=1/10
0.1