问题 解答题

解方程:(1)4x2-4x+1=0;

(2)(x-7)(x+3)+(x-1)(x+5)=4x

答案

(1)4x2-4x+1=0;

x2-x+

1
4
=0;

(x-

1
2
2=0,

x 1
=
x 2
=
1
2

(2)(x-7)(x+3)+(x-1)(x+5)=4x,

2x2-4x-26=0,

x2-2x-13=0;

(x-1)2=14,

x 1
=1+
14

x 2
=1-
14

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