两种方法：
第一种：
2X^2+X-2=-1
2X^2+X=1
X^2+1/2X=1/2
(X+1/4)^ 2-1/16=1/2
(X+1/4)^ 2=9/16
X+1/4=±3/4
X=1/2或X=-1
第二种：
2x^2+x-2=-1
2x^2+x-1=0
(x+1)(2x-1)=0
x=-1或x=1/2
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