（x平方-2）分之1小于等于|x|分之1∴x²-2＞0x√2此时,x²-2≥|x|(x²-2)²≥x²x^4-4x²+4≥x²x^4-5x²+4≥0(x²-4)(x²-1)≥0(x+2)(x-2)(x+1)(x-1)≥0解得x≤-2,-1≤x≤...