问题
解答题
(1)解不等式组
(2)解方程:x2-4x-5=0. |
答案
(1)
,2x-1>x① x-3≤
x-1②1 2
解①得x>1,
解②得x≤4,
则1<x≤4;
(2)(x-5)(x+1)=0,
x-5=0或x+1=0,
则x1=5,x2=-1.
(1)解不等式组
(2)解方程:x2-4x-5=0. |
(1)
,2x-1>x① x-3≤
x-1②1 2
解①得x>1,
解②得x≤4,
则1<x≤4;
(2)(x-5)(x+1)=0,
x-5=0或x+1=0,
则x1=5,x2=-1.