Question

ex 3,4 dau coroanaa va roog​

Answer 1

Explicație pas cu pas:

3.

a) 0,2 + 0,1 - 0,3 = 0,3 - 0,3 = 0

b)

$\dfrac{1}{2} + \dfrac{1}{3} + \dfrac{1}{6} - 2 = \dfrac{3 + 2 + 1}{6} - 2 = \dfrac{6}{6} - 2 = 1 - 2 = - 1$

c)

$\Big| - \dfrac{1}{2}- \dfrac{1}{4} \Big| + \Big| - \dfrac{1}{2}\Big| : 2 = \Big| - \dfrac{2 + 1}{4} \Big| + \dfrac{1}{2} \cdot \dfrac{1}{2} = \dfrac{3}{4} + \dfrac{1}{4} = \dfrac{4}{4} = 1$

d)

$(-8) : 4 - 20 : 5 = - 2 - 4 = - 6$

4.

a) x = ± 1,5

b) x = ± √2

c) |x| = 5 + 3 => |x| = 8 => x = ±8

d) 14 - 3|x| = 5 => 3|x| = 14 - 5 => 3|x| = 9

=> |x| = 3 => x = ± 3