Question

1. Se considera multimea :

A={ $\sqrt{0,(8)} ; \frac{-21}{-7} ; \sqrt{2,25} ; 6\frac{1}{4} ; -\frac{14}{2} ; 3\sqrt{\frac{1}{9} } ; (-2)^{3}$

Cardinalul multimii A-(R-Q) este.....

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

$\it \sqrt{2,25}=1,5\in\mathbb{Q}\\ \\ \sqrt{\dfrac{1}{9}}=\dfrac{1}{3}\in\mathbb{Q}\\ \\ card(A) =7\\ \\ \sqrt{0,(8)}\in\mathbb{R}-\mathbb{Q} \Rightarrow cardA-(\mathbb{R}-\mathbb{Q})=6$