Question

Calculati
[tex]a) \sqrt{49}
b) \sqrt{1
} [/tex]
c)$\sqrt{0,01}$
d)$\sqrt{(3,2} ) ^{2}$
e)$(\sqrt{12,71} ) ^{2}$
f)$\sqrt{(-4,21)} ^{2}$
ex 3 
calculati
$2 \sqrt{49} - 2\sqrt{25} b) 4\sqrt{16} - 2\sqrt{81}$
c)$10 \frac{ \sqrt{81} }{100}$
e)$100 \sqrt{0,04} - \sqrt{144}$

Answer 1

    
$a) \,\, \sqrt{49} = 7 \\ b)\,\, \sqrt{1} =1 \\ c)\,\, \sqrt{0,01}=0,1 \\ d)\,\, \sqrt{(3,2)^{2}}=3,2 \\ e)\,\,( \sqrt{12,71})^{2} = 12,71 \\ f)\,\, \sqrt{(-4,21)^{2}} =\sqrt{(4,21)^{2}} = 4,21$

Ex. 3) Calculati:

$a)\,\, 2 \sqrt{49} - 2 \sqrt{25}=2(\sqrt{49} - \sqrt{25}) = 2(7 - 5)= 2 * 2 = 4 \\ \\ b) \,\, 4 \sqrt{16}-2 \sqrt{81} =4*4 - 2*9 = 16 - 18 = -2 \\ \\ c)\,\, 10* \sqrt {\frac{ 81 }{100}}= \frac{10*9}{10}= 9 \\ \\ d) \,\, ??? \\ \\ e)\,\, 100 \sqrt{0,04} - \sqrt{144} =100*0,2 - 12 = 20 - 12 = 8$