Answer? +3a+ 1=0
(a？ +3a+ 1)/a=0
a+3+ 1/a=0
a+ 1/a=-3
(a+ 1/a)？ =(-3)?
Answer? +2+ 1/a？ =9
Answer? + 1/a？ =7 A: a+ 1/a=-3，A？ + 1/a？ =7
Two: it is known that x is an integer. If the score (2x+ 2) /(x? The value of-1) is an integer, so find the value of x.
(2x+ 2) /(x？ - 1)
= 2(x+ 1)/(x+ 1)(x- 1)
=2/(x- 1)
So x can be: x- 1= 1, x-1=-kloc-0/,x- 1=2, x- 1=-2.
x=2、0、3 、- 1
A: X can be 2, 0, 3,-1.