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20 \\ 2 ^{x}\cdot (2 ^{2}+1)>20 \\ 2 ^{x}\cdot 5>20 \\ 2 ^{x}>4 \\ 2 ^{x}>2 ^{2} \\ x>2" alt="1)2 ^{x+2}+2 ^{x}>20 \\ 2 ^{x}\cdot (2 ^{2}+1)>20 \\ 2 ^{x}\cdot 5>20 \\ 2 ^{x}>4 \\ 2 ^{x}>2 ^{2} \\ x>2" align="absmiddle" class="latex-formula">
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1,25 \\ 4 ^{x}\cdot (4+1)>1,25 \\ 4 ^{x}\cdot 5>1,25 \\ 4 ^{x}>0,25 \\ 4 ^{x}>4 ^{-1} \\ x>-1" alt="2)4 ^{x+1}+4^{x}>1,25 \\ 4 ^{x}\cdot (4+1)>1,25 \\ 4 ^{x}\cdot 5>1,25 \\ 4 ^{x}>0,25 \\ 4 ^{x}>4 ^{-1} \\ x>-1" align="absmiddle" class="latex-formula">