4(1-x)²=9 ,(x-3)²+2x(x-3)=0 ,2x²-5+1=0(用配方法)
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4(1-x)²=9 ,(x-3)²+2x(x-3)=0 ,2x²-5+1=0(用配方法)
4(1-x)²=9 ,(x-3)²+2x(x-3)=0 ,2x²-5+1=0(用配方法)
4(1-x)²=9 ,(x-3)²+2x(x-3)=0 ,2x²-5+1=0(用配方法)
4(1--x)^2=9
(x--1)^2=9/4
x--1=正负3/2
x1=5/2, x2=--1/2.
(x--3)^2+2x(x--3)=0
(x--3)[(x--3)+2x]=0
(x--3)(3x--3)=0
x1=3, x2=1,
2x^2--5x+1=0
x^2--(5/2)x+(1/2)=0
x^2--(5/2)x+(25/16)=(--1/2)+(25/16)
(x--5/4)^2=17/16
x--5/4=正负(根号17)/4
x1=(5+根号17)/4, x2=(5--根号17)/4.