缘聚缘散8
幼苗
共回答了17个问题采纳率:100% 举报
(1)x2+12x+25=0,
x2+12x=-25,
x2+12x+36=-25+36,
(x+6)2=11,
x+6=±
11,
x1=
11-6,x2=-
11-6;
(2)x2+4x=10,
x2+4x+4=14,
(x+2)2=14,
x+2=±
14,
x1=
14-2,x2=-
14-2;
(3)x2-6x=11,
x2-6x+9=20,
(x-3)2=20,
x-3=±2
5,
x1=2
5+3,x2=3-2
5.
1年前
3