0\; \; \to \; \; (6^{x}-12)>-12\; \; \Rightarrow \\\\-12<6^{x}-12<+\infty \\\\y\in (-12,+\infty )\\\\A21.\; \; P=\frac{150-15}{150}=\frac{135}{150}=0,90" alt="A20.\; \; y=6^{x}-12\\\\6^{x}>0\; \; \to \; \; (6^{x}-12)>-12\; \; \Rightarrow \\\\-12<6^{x}-12<+\infty \\\\y\in (-12,+\infty )\\\\A21.\; \; P=\frac{150-15}{150}=\frac{135}{150}=0,90" align="absmiddle" class="latex-formula">
\frac{220}{25}\\\\R>8,8" alt="A23.\; \; I=\frac{U}{R}<25\; ,\; \; \farc{220}{R}<25\\\\R>\frac{220}{25}\\\\R>8,8" align="absmiddle" class="latex-formula">