Question

Exercițiu 1 , 2 sau 3 ! Care se poate , măcar unul , va rog

Answer 1

1.
a)27+24:(-8)=27-3=24
b)-3,4
c)[-7,4)

2.
a)0,(2)=2/9
0,18=18/100=9/50
√(2/9 · 9/50)=√(1/25)=1/5
b)A∈(-∞,2]-{0} sau A∈[-1,+∞)
c)(x²-3x+1)²-1=(x²-3x+1-1)(x²-3x+1+1)=(x²-3x)(x²-3x+4)=x(x-3)(x²-3x+4)

3.
a)(2x-1)²-4x(x-3)=4x²-4x+1-4x²+12x
                          =8x+1
b){1,2,3,5}
c)$\frac{x ^{3} -4x ^{2} -x+4}{ x^{2} -5x+4} = \frac{ x^{2} (x-4)-(x-4)}{(x-1)(x-4)} = \frac{(x-4)( x^{2} -1)}{(x-4)(x-1)} = \frac{(x-1)(x+1)}{(x-1)} =(x+1)$