3√(x^2-2x+1)-√(x^2+4x+4) (-2小于等于x小于1)
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3√(x^2-2x+1)-√(x^2+4x+4) (-2小于等于x小于1)
3√(x^2-2x+1)-√(x^2+4x+4) (-2小于等于x小于1)
3√(x^2-2x+1)-√(x^2+4x+4) (-2小于等于x小于1)
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