Question

CINEVA BUN LA MATE MĂCAR CÂTEVA ​

Answer 1

11)

${x}^{2} - 4x + 4 = \\ = {x}^{2} - 2x - 2x + 4 = \\ = x(x - 2) - 2(x - 2) = \\ = (x - 2)(x - 2) = \\ = (x - 2) {}^{2} = \color{green}patrat \: perfect$

12)

$\color{red} {(a + b)}^{3} = {a}^{3} + 3a {}^{2}b + 3ab {}^{2} + b {}^{3}$

$(x + 2) {}^{3} = x {}^{3} + 6 {x}^{2} + 12x + 8$

$\color{red} {(a - b)}^{3} = {a}^{3} - 3a {}^{2}b + 3ab {}^{2} - b {}^{3}$

$(x - 2) {}^{3} = x {}^{3} - 6x {}^{2} + 12x - 8$

$(x + 2) {}^{3} + ( {x - 2)}^{2} = \\ = (x {}^{3} + 6x {}^{2} + 12x + 8) + (x {}^{3} - 6x {}^{2} + 12x - 8) = \\ = 2x {}^{3} + 24x = 2x(x {}^{2} + 12)$

(daca nu vezi tot glisează spre stânga )

13)

probabilitatea = Nr cazuri favorabile / Nr cazuri posibile

Nr cazuri posibile = 4 +6+8=18

nr cazuri favorabile = 8

probabilitatea= 8/18 simplificam prin 2=2/9

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