4X方 - X - 9 = 0配方法求.

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4X方 - X - 9 = 0配方法求.4X方 - X - 9 = 0配方法求.4X方 - X - 9 = 0配方法求.4X方 - X - 9 =0x^2-x/4+1/64-1/64-9/4=0(x-

4X方 - X - 9 = 0配方法求.
4X方 - X - 9 = 0
配方法求.

4X方 - X - 9 = 0配方法求.
4X方 - X - 9 =0
x^2-x/4+1/64-1/64-9/4=0
(x-1/8)^2=145/64
x-1/8=±√149/8
x=(1±√149)/8