解:(x-5)²=2(5-x)
x²-10x+25=10-2x
x²-8x+15=0
x²-8x+16-1=0
(x-4)²=1
因此,x-4=1,或x-4=-1
结果是:x=5,或x=3
(x-5)²=2(5-x)
解:(x-5)²=-2(x-5)
(x-5)²+2(x-5)=0
(x-5)(x-5+2)=0
x-5=0 或 x-3=0
x1=5 x2=3
(x-5)²=2(5-x)
(x-5)²+2(x-5)=0
(x-5)(x-5+2)=0
(x-5)(x-3)=0
x=5,x=3
(x-5)²=2(5-x)
(x-5)(x-5)=-2(x-5)
x-5=-2
x=3
就是: x = 5 等式成立,然后
5 - x = 2
x = 3