a, -5/19 + 3/19 < x/19 $\leq$ 13/19 + -11/19 b, -7/8 + 5/6 < x/24 $\leq$ 5/8 + -5/12

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1. a) `-5/19+3/19<x/19≤13/19+-11/19`

   `⇒ -2/19<x≤2/19`

   `⇒ x={-1; 0; 1; 2}`

   b) `-7/8+5/6<x/24≤5/8+-5/12`

   `⇒ -1/24<x≤5/24`

   `⇒ x={0; 1; 2; 3; 4; 5}

    

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2. a, Ta có: $\frac{-5}{19}+$ $\frac{3}{19}<$ $\frac{x}{19}<$ $\frac{13}{19}+$ $\frac{-11}{19}$

   ⇒$\frac{-2}{19}<$ $\frac{x}{19}<$ $\frac{2}{19}$ 

   ⇒x∈{-1;0;1}

   b, Ta có: $\frac{-7}{8}+$ $\frac{5}{6}<$ $\frac{x}{24}<$ $\frac{5}{8}+$ $\frac{-5}{12}$

   ⇒$\frac{-1}{24}<$ $\frac{x}{24}<$ $\frac{5}{24}$ 

   ⇒x∈{0;1;2;3;4}

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