Question

Ex 1 A. B. C. DAU COROANAA.

Answer 1

Răspuns:

a) x-x+x=x

b) 2a^3-a+a^3-4a^3=2a^3-a-3a^3=-a^3-a

c) nu știu

Answer 2

Explicație pas cu pas:

1.a)

$x - x + x = 2x - x = x$

b)

$2 {a}^{3} - a + {a}^{3} - 4{a}^{3} = 3{a}^{3} - 4{a}^{3} - a = - {a}^{3} - a = - a({a}^{2} - 1)$

c)

$2x - {x}^{3} + \dfrac{1}{2} {x}^{2} + \sqrt{5} - 2.5x + 0.5{x}^{3} - {x}^{2} = \\ = 0.5{x}^{3} - {x}^{3} + \dfrac{1}{2} {x}^{2} - {x}^{2} + 2x - 2.5x + \sqrt{5}$

$= - 0.5{x}^{3} - \dfrac{1}{2} {x}^{2} - 0.5x + \sqrt{5}$

$= - 0.5x({x}^{2} + x + 1) + \sqrt{5}$