3√(1/5) + 1 √20 + √(4/5) =3√1 + √4*√5 +√4 = 3 + 2√5 + 2 =
2 √5 2 √5 √5 2 √5
= 5 + √5 = 5√5 + √5=5√5 + √5 =√5 +√5 =2√5
√5 √5 * √5 5
(d+4)³-(d+1)(d+3)=d³+3d²*4+3d*4²+4³-(d²+d+3d+3)=
=d³+12d²+48d+64-d²-4d-3=d³+11d²+44d+61
(1 ²/₅ - ⁷⁹/₂₀) : 1 ¹¹/₄₀ =(⁷/₅ - ⁷⁹/₂₀) : ⁵¹/₄₀ =28-79 * 40 = -51 * 40 =-2
20 51 20 51
10 ¹/₂ - 3 ³/₄ = 21 - 15 = 42-15 = 27 =6 ³/₄
2 4 4 4