2x-2≤1-x²≤3x²-3x
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2x-2≤1-x²≤3x²-3x
![2x-2≤1-x²≤3x²-3x](/uploads/image/z/2697203-11-3.jpg?t=2x-2%E2%89%A41-x%26%23178%3B%E2%89%A43x%26%23178%3B-3x)
分两个
2x-2≤1-x²
x²+2x-3≤0
(x+3)(x-1)≤0
-3≤x≤1
1-x²≤3x²-3x
4x²-3x-1≥0
(4x+1)(x-1)≥0
x≤-1/4,x≥1
所以
-3≤x≤-1/4,x=1
2x-2≤1-x²
x²+2x-3≤0
(x+3)(x-1)≤0
-3≤x≤1
1-x²≤3x²-3x
4x²-3x-1≥0
(4x+1)(x-1)≥0
x≤-1/4,x≥1
所以
-3≤x≤-1/4,x=1
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