Question

номера не надо!дам 10 балов

Answer 1

$= ({ \frac{13 + 12}{12 \times 13} })^{2} \times ( { \frac{12 \times 13}{13 - 12} })^{2} \times \frac{1}{ {10}^{3} } = \frac{ {25}^{2} }{ {(12 \times 13)}^{2} } \times \frac{ {(12 \times 13)}^{2} }{ {(13 - 12)}^{2} } \times \frac{1}{ {10}^{3} } = \frac{ {25}^{2} }{ {10}^{3} } = \frac{ {5}^{4} }{ {2}^{3} \times {5}^{3} } = \frac{5}{8}$