Question

a professora não explicou, me ajudem por favor! o resultado da entre 0 e 1

Answer 1

$\frac{10^4\cdot10^n-10^3\cdot10^n}{10^4\cdot10^n}=\\\\\frac{10000\cdot10^n-1000\cdot10^n}{10000\cdot10^n}=\\\\\frac{9000\cdot10^n}{10000\cdot10^n}=\\\\\boxed{\frac{9}{10}}$