Question

Решите систему неравенств​

Answer 1

Ответ:

$\left \{ {{\frac{x}{2} -\frac{x}{5} >3} \atop {21-x>1}} \right.  =>\left \{ {{5x-2x>30} \atop {x<20}} \right. =>\left \{ {{3x>30} \atop {x<20}} \right. =>\left \{ {{x>10} \atop {x<20}} \right.$

Объяснение: