(1)解不等式组5x-1>2x+5x-4<3x+1 (2)化简:x+1/x÷ x2-1x2.
问题描述:
(1)解不等式组
5x-1>2x+5 x-4<3x+1
(2)化简:
÷ x+1 x
.
x2-1 x2
答
(1)
,
5x-1>2x+5① x-4<3x+1②
解不等式①得x>2,
解不等式②得x>-2.5,
所以不等式组的解集为x>2;
(2)原式=
•x+1 x
x (x+1)(x-1)
=
.1 x-1