(2014•大连一模)解方程:x(x-2)=2x+1.
1个回答
x(x-2)=2x+1,
x
2
-2x=2x+1,
x
2
-4x+4=5,
(x-2)
2
=5.
∴x-2=±
5,
即x
1
=2+
5,x
2
=2-
5.
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