答案
解:(1)4x
2-4x+1=0;
x
2-x+
=0;
(x-
)
2=0,
==;
(2)(x-7)(x+3)+(x-1)(x+5)=4x,
2x
2-4x-26=0,
x
2-2x-13=0;
(x-1)
2=14,
=1+.
=1-
解:(1)4x
2-4x+1=0;
x
2-x+
=0;
(x-
)
2=0,
==;
(2)(x-7)(x+3)+(x-1)(x+5)=4x,
2x
2-4x-26=0,
x
2-2x-13=0;
(x-1)
2=14,
=1+.
=1-