Question

номера не надо!дам 10 балов

Answer 1

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