Решите уравнение x4 = 1/81
x4–(1/3)4=0 (x2–(1/3)2)·(x2+(1/3)2)=0 (x–(1/3))·(x+(1/3))·(x2+(1/9))=0 x–(1/3)=0 или x+(1/3)=0 x=1/3 или x=–1/3