Question

Aflati x din:
a) 7 - 2x=1 x apartine lui n
b) $\frac{3}{x-2}$ = 0,(6) x apartine lui Q
c) 4x^2 = 100 x apartine lui Z
d) 5-3x ≥ - 4 x∈ N

Answer 1

a) -2x=-6
     x=$\frac{-6}{-2} =3$
b) $0,(6)= \frac{2}{3}$
    $\frac{3}{x-2}= \frac{2}{3}$→2(x-2)=9 ...x-2=4.5.....x=6.5
c)$4x^{2} =100..... x^{2} =25........x=+sau - 5$

d) 5-3x$\geq$-4
   $-3x \geq -9.........x \leq \frac{-9}{-3} ...........x \leq 3$