racionalize:
a)
b)
c)
d)
e)
f)
g)
Soluções para a tarefa
Resposta:
Explicação passo-a-passo:
Racionalize:
´´é ELIMINAR A raiz DO DENOMINADOR
a)
\frac{5}{ \sqrt{2} }
5 5√2 5√2 5√2 5√2
------ = --------- = --------------- = ------------ = -----------
√2 √2(√2) √2x2 √4 2 (dica √4 = 2)
b)
\frac{8}{ \sqrt[3]{ {2}^{2} } }
8
--------
∛2² atençãooooooooooooo
8 8∛2¹
----- = -------------- vejaaaaaaaaaaaaaaaaaaa
∛2² ∛2².∛2¹
8∛2¹
----------
∛2¹⁺² vejaaaaaaaaaaaa
8∛2
-------
∛2³ ( elimina a ∛(raiz cubica) com o (³))
8∛2
--------- = 4∛2
2
c)
\frac{9}{ \sqrt{5} }
9 9√5 9√5 9√5 9√5
------ = ------------ = ------------- = -----------= ----------
√5 √5√5 √5x5 √25 5 (dica √25 = 5)
d)
\frac{5}{3 \sqrt{2} }
5 5√2 5√2 5√2 5√2 5√2
------- = ------------ = ------------ = ---------- = -----------= ---------
3√2 3√2√2 3√2x2 3√4 3.2 6 (dica √4 = 2)
e)
\frac{14}{ \sqrt[8]{ {7}^{5} } }
14
-----
⁸√7⁵ vejaaaaaaaaaaaaaaa
14.⁸√7³
-------------
⁸√7⁵. ⁸√7³ vejaaaaaaaaaaaaaa
14.⁸√343
------------
⁸√7⁵⁺³
14.⁸√343
--------------
⁸√7⁸ elimina a ⁸√(raiz oitava) com o (⁸)
14.⁸√343
--------------- = 2.⁸√343
7
f)
\frac{4}{7 - \sqrt{5} }
4
-----
7 - √5
4(7 + √5)
---------------
(7 - √5)( 7 + √5) vejaaaaaaaaaaaaaaa
4(7 + √5)
---------------------------------
49 + 7√5 - 7√5 - √5√5
4(7 + √5)
------------------
49 + 0 - √5x5
4(7 + √5)
-----------------
49 - √25 ===>(dica √√25 = 5)
4(7 + √5)
----------------
49 - 5
4(7 + √5) ( 7 + √5)
---------------- = -------------------
44 11
g)
\frac{10}{ \sqrt{3} - 2}
10
-------
√3 - 2
10(√3 + 2)
----------------------
(√3 -2)(√3 + 2)
10(√3 + 2)
------------------------------
√3√3 + 2√3 - 2√3 - 4
10(√3 + 2)
------------------
√3x3 + 0 - 2
10(√3 + 2)
----------------
√9 - 2 (√9= 3)
10(√3 + 2)
----------------
3 - 2
10(√3 + 2)
----------------- = 10(√3 + 2) ou 10(2 + √3)
1