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+
=0;1 4
(x-
)2=0,1 2
=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,
=1+x 1
.14
=1-x 2 14