Question

URGENTE!!
Efetue:
$a) \: \: 7.[ \sqrt{ \frac{1}{49} } \: - \: ( \frac{3}{5} + \frac{2}{5} )]$


$b) \: 4.[ \sqrt{2 .25} \: - \: (2 - \sqrt{9)} ]$

Answer 1

7.[ 1/7 -(5/5)]

7.[1/7-1]

7.[1-7/7]

7.[-6/7]

-42/7= -6

B)4.[√2.25 - (2-√9)]

4.[√50 -2-√9]

4 .[5.√2 -2-3]

4.[5.√2-5]

20√2-20