Question

1. Efectuati: $( \frac{1}{36} - \frac{1}{24} ) : \frac{1}{48}$
2. Efectuati: $\sqrt{ \frac{8}{14} } : \frac{1}{ \sqrt{63} }$
3. Fie A= {$\sqrt{2} ; \frac{3}{4} ; \frac{ \sqrt{3} }{2} ; -1$ }. Calculati A∩Q
4. Fie ABC un triunghi si D ∈ AB, E∈ AC, DE║BC. Daca $\frac{AD}{DB} = \frac{3}{4}$ , atunci valoarea raportului $\frac{EC}{AC}$ este egala cu?

Answer 1

1)(1/36-1/24):1/48=
(2-3/72):1/48=
-1/72:1/48=-1/72x48=-48/72=-24/36=-12/18=-6/9=-2/3

2)√8/14:1/√63=√8/14x√63=√504/14=√252/7

3)A={√2.3/4..√3/2,-1}
A∩Q
A={√2.√3/2}
SUCCES