Question

Fie A={-3;0;5;(4); | π -4|; 7;√4;√5}.
a) Completati caseta: card A=........
b) Aflati: A∩N; A∩Z; A∩Q.
c) Ordonati crescator elementele multimii A.
d) Rezolvatii in R ecuatia:[18÷(-3)³-7⁻²·5,(4)]·(x-1)=√4+2x

Answer 1

a) card A=7
b) A∩N={0; 7;√4.
A∩Z={-3;0; 7;√4}.
A∩Q={-3;0;5,(4); 7;√4}.
c)-3;0; | π -4|; √4;√5, 5,(4), 7
d) [18/-27 - 1/49 * 54-5/9 ](x-1)=2+2x


[-6/9 - 1/9 ](x-1)=2+2x

-7/9 (x-1)=2+2x

-7(x-1)=9(2+2x)
-7x+7 = 18 +18x
-11=25x
x=-25/11