问题
解答题
解方程:(x-1)(x-3)=8.
答案
(x-1)(x-3)=8,
x2-4x+3=8,
x2-4x=5,
x2-4x+4=9,
(x-2)2=9,
x-2=±3,
x1=3+2=5,x2=2-3=-1;
解方程:(x-1)(x-3)=8.
(x-1)(x-3)=8,
x2-4x+3=8,
x2-4x=5,
x2-4x+4=9,
(x-2)2=9,
x-2=±3,
x1=3+2=5,x2=2-3=-1;