Question

28 c) va rog, dau coroana!!

Answer 1

Răspuns:

$(\frac{x+1)2}{x-2}-\frac{x-2)2}{x+1}):\frac{2}{x(x+1)(x-2)}   =\frac{2x+2-2x+4}{(x+1)(x-1)} *\frac{x(x+1)(x-2)}{2} =\frac{6x}{2} =3x$

x∈Z ⇒ A(x)∈Z

A(x)(2-√5)=3x(2-√5)=6x-3x√5

√5∉Q ⇒ 6x-3x√5∉Q ⇒A(x)(2-√5)

Explicație pas cu pas: