Question

1.determinati multimea de adevar a predicatului p(x):2x+3/2x+1 , x apartine Z

2.Rezolvati in multimea numerelor rationale ecuatia |x| + x=1

Answer 1

Răspuns:

1.p(x):2x+3/x+1 , x€Z

2x+3/x+1=0

0*x+1=2x+3

2x+3=0

2x=-3

x=-3/2

-3/2€Q

-3/2UZ={multime vida}

Sp(x)={multime vida}

2.

|x|+x=1

x+x=1

2x=1

x=1/2