Question

AJUTORRRR, ESTE URGENTTTTT, MA POATE AJUTA CINEVA?
DAU COROANAAAA​

Answer 1

Răspuns:

Explicație pas cu pas:

primul

2x=23+13=36...x=18

al dolea21≥x+1≥15 |-1

20≥x≥14...

14≤x≤21

x∈{14;15...21}

Answer 2

$\it a)\ (5^2)^x=5^{23}\cdot5^{13} \Rightarrow 5^{2x}=5^{36} \Rightarrow 2x=36 \Rightarrow x=36:2 \Rightarrow x=18\\ \\ b)\ \dfrac{3}{5}\geq\dfrac{x+1}{35}\geq\dfrac{3}{7}|_{\cdot{35}} \Rightarrow 21\geq x+1\geq15|_{-1} \Rightarrow 20\geq x\geq14 \Rightarrow \\ \\ \\ \Rightarrow 14\leq x\leq20 \Rightarrow x\in\{14,\ 15,\ 16,\ 17,\ 18,\ 19,\ 20\}$