[Siren-Of-Step]

ช่วยหน่อยครับ

1.$ r = \left\{\,\right. (x,y) \in R \times R \left|\,\right. y \leqslant x^2 และ x+y \leqslant 3 \left.\,\right\} $

2. $ r = \left\{\,\right. (x,y) \in R \times R \left|\,\right. x^2+y^2 \leqslant 9 และ x^2-y^2 \geqslant 1 \left.\,\right\} $

3. $ r = \left\{\,\right. (x,y) \in R \times R \left|\,\right. \left|\,\right. x\left|\,\right. +\left|\,\right. y\left|\,\right. \leqslant 2 และ \left|\,\right. x\left|\,\right. -\left|\,\right. y\left|\,\right. \leqslant 1 \left.\,\right\}$

4.$ r = \left\{\,\right. (x,y) \in R \times R \left|\,\right. y\leqslant \sqrt{x} $