a ) (3√2 + √18 - 2√8) √2
b) (2√6 + 6) ( 2√3 + 3√2)
c) √5 i 9/27 : √1 i 3/9
d) ³√-3 ¾ : ³√-1 i 23/25
e) ³√3 i 3/8 · √36
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a )
(3√2 + √18 - 2√8) √2 =3√2 * √2 + √18 *√2 - 2√8 * √2 = 3 * 2 + √36 -2√16 = 6 + 6 - 2 * 4 = 12 - 8 = 4
b) (2√6 + 6) ( 2√3 + 3√2) = 4√18 + 6√12 + 12√3 + 18√2 = 4 * 3√2 + 6 * 2√3 + 12√3 + 18√2 = 12√2 + 12√3 + 12√3 + 18√2 = 30√2 + 24√3
c) √5 i 9/27 : √1 i 3/9 = √5 i 1/3) : √(1 i 1/3) = √(16/3) : √(4/3) = 4/√3 : 2/√3 = 4/√3 * √3/2 = 4/2 = 2
d) ³√-3 ¾ : ³√-1 i 23/25 = ∛(-15/4) : ∛(-48/25) = ∛[-15/4 * (-25/48)] = ∛(125/64) = 5/4 = 1,25
e) ³√3 i 3/8 · √36 = ∛(27/8) * 6 = 3/2 * 6 = 9