помогите пожалуйста.
1)(x+1)(x+2)(x+3) / (2x-1)(x+4)(3-x) >0

2) x^2-4x-2 / 9-x^2 <0

3) 1 /x+1 + 2 / x+3 > 3 / x+2

4) 1 / x < 1 / 3

5) 1 / x+1 - 2 / x^2-x+1 <(или равно)  1-2x / x^3+1 .
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