因式分解法计算： ①(x+2)²=(5-2x)² ②2x(x+2)=3x+6 ③x²-x=x-1

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①(x+2)²=(5-2x)²
(x+2)²-(5-2x)²=0
(x+2+5-2x)(x+2-5+2x)=0
(-x+7)(3x-3)=0
x=7 x=1

②2x(x+2)=3x+6
2x(x+2)-3(x+2)=0
(x+2)(2x-3)=0
x=-2 x=3/2

③告哗x²液友埋-x=x-1
x²闹蚂-2x+1=0
(x-1)²=0
∴x=1

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1.(x-4)²=9
2.
3.x²-2x+1=0

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