Question

Решите эти 3 задания

Answer 1

$|2- \sqrt{5} |-|2+\sqrt{5}|=-2+\sqrt{5}-2-\sqrt{5}=-4$

$\log_{\sqrt{7}} \frac{4x-3}{5x+8}=0$
ОДЗ: $\frac{4x-3}{5x+8}\ \textgreater \ 0$

$\log_{\sqrt{7}} \frac{4x-3}{5x+8}=\log_{\sqrt{7}}1 \\ \frac{4x-3}{5x+8}=1 \\ 4x-3=5x+8\\ 4x-5x=8+3\\ x=-11$

$6(3+5y)-(2+7y) \leq 5(4+3y)\\ 30y+18-2-7y-(15y+20) \leq 0 \\ 30y+18-2-7y-15y-20 \leq 0\\ 8y-4 \leq 0\\ 8y \leq 4 \\ y \leq 0.5$