$f\left(x\right)=8-x^3\ \ ,\ g\left(x\right)=x-3\ ,\ \ \ \ مجال\ \ الدالة\ \left(f-g\right)\left(x\right)$  

 $F\left(x\right)=8-x^3,g\left(x\right)=x-3,\ \ \left(\frac{\text{f}}{\text{g}}\right)\left(x\right)\ =مجالها$