a) [(5 do 20 potęgi + 5 do -18 potęgi)*(3 do 4 potęgi)³]/(5 do 16 potęgi + 5 do 14 potęgi)*9 do 5 potęgi =
b) [(11√3-4√7)/(√3-√7)] - [(13√7+√3)/(√12-√28)] =
c) [√(2-√3) - √(2+√3)]² =
d) [(4-2 do potęgi ½) do potęgi ½ + (4 + 2 do potęgi ½) do potęgi ½]² =
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a) [(5 do 20 potęgi + 5 do -18 potęgi)*(3 do 4 potęgi)³]/(5 do 16 potęgi + 5 do 14 potęgi)*9 do 5 potęgi =
[ (5²⁰ + 5⁻¹⁸)* ( 3⁴)³] : ( 5¹⁶ + 5¹⁴)*9⁵ =
= [ ( 5²⁰ + 5⁻¹⁸)* 3¹² ] : [ 5¹⁴(5² + 1) ] * (3²)⁵ =
= [ (5²⁰ + 5⁻¹⁸)* 3¹²] : [ 5¹⁴*(26)] *3¹⁰ =
= [ (5²⁰ + 5⁻¹⁸)] : [ 5¹⁴*26 ] *(3¹² : 3¹⁰)=
= [ 5¹⁴( 5⁶ + 5 ⁻³²) ] :[ 5¹⁴*26] *3² =
= [( 5⁶ + 5⁻³²)*3²] : 26 =
= (5⁶*3²) : 26 + (5⁻³²*3²) : 26
b) [(11√3-4√7)/(√3-√7)] - [(13√7+√3)/(√12-√28)] =
(11√3 - 4√7) (13√7 + √3)
= ---------------- - ------------------ =
√3 - √7 2√3 - 2√7
2(11√3 -4√7) (13√7 + √3)
= ---------------- - ---------------- =
2(√3 - √7) 2(√3 - √7)
22√3 - 8√7 -(13√7 + √3 )
= ---------------------------------- =
2(√3 - √7)
22√3 - 8√7 -13√7 -√3
= --------------------------- =
2(√3 - √7)
21√3 - 21√7
= -------------------- =
2( √3 - √7)
21( √3 - √7) 21
= --------------- = ------- = 13,5
2( √3 - √7) 2
c) [√(2-√3) - √(2+√3)]² =
= [√(2 -√3)]² - 2*√(2 -√3)*√(2+√3) + [ √(2+√3)]² =
= 2 - √3 - 2*√[2 -√3)(2 + √3)] + 2 + √3 =
= 4 - 2*√(4 -3) =
= 4 - 2*√1 =
= 4 - 2 =
= 2
d) [(4-2 do potęgi ½) do potęgi ½ + (4 + 2 do potęgi ½) do potęgi ½]² =
= [(4 -√2)^(1/2)]² + 2*(4 -√2)^(1/2) *(4 + √2)^(1/2) + [ (4 + √2)^(1/2)]² =
= 4 - √2 + 2*√[(4 -√2)(4 +√2)] + 4 + √2 =
= 8 + 2√(16 -2) =
= 8 + 2√14 =
= 2(4 + √14)