x(1-x)=0.06 解出x x(x-1)=132 同样

问题描述:

x(1-x)=0.06 解出x x(x-1)=132 同样

x^2 -x + 0.06 = 0
a = 1,b = -1,c = 0.06
b^ - 4ac = 1 - 0.24 = 0.76>0
所以x = (1 + 根号0.76)/2
x = (1 - 根号0.76)/2
即:
x = 1/2 + (根号19)/10 或
x = 1/2 - (根号19)/10
2)
x^2 -x - 132 = 0
(x-12)(x+11)=0
x = 12,x = -11