Question

Решите неравенство:(1/3)^{1-3x} <1/81

Answer 1

$(frac{1}{3})^{1-3x}<frac{1}{81}\\(frac{1}{3})^{1-3x}<(frac{1}{3})^4\\1-3x>4\\3x<-3\\x<-1\\xin (-infty,-1)$