Объяснение:
log_{3-x}5\; \; \to \; \; \left \{ {{3-x>0} \atop {3-x\ne 1}} \right. \; \; \left \{ {{x<3} \atop {x\ne 2}} \right. \; \ ;\to \; \; x\in (-\infty ,2)\cup (2,3)
