b_21) (256)^(1/4) -1/3∛27/8 =4 -(1/3)*(3/2) =4 -1/2 =3,52) а) x³ =-512 ;x = -8 .б) (x+2)^(1/4) =3 ;x+2 =3⁴ ;x=81 -2 =79.3) 2π или ∛215 .2π >6 ; ∛215 <∛216=6. 2π > ∛215 ****************b_31) (243)^(1/5) +3∛(4 17/27) =(3^5) ^(1/5) +3∛125/27 =3+3*5/3 =8.^2) а) x^8 =256 ;(x^4)^2 (2^4) ^2 ;x^4 =16;(x²)² =4²x² =4;x = ±2.б) (x² -x -40)^(1/4) =2 ;x² -x -40 =2^4 ;x² -x -40 =16;x² -x -56 =0;x₁ = -7;x₂ =8.3)π/2 или ∛9 .π/2 < 4/2=2 =∛8 < ∛9.π/2 < ∛9 .