Question

Как найти область допустимых значений ?

Answer 1

$\sqrt{25-5x}-\sqrt{13x-52}\\\left \{ {{25-5x\geq 0 } \atop {13x-52\geq 0}} \right. <=>\left \{ {{x\leq 5} \atop {x\geq 4}} \right. =>4\leq x\leq 5$