Question

284 и 285 плиииз
даю 20 бал

Answer 1

284.
$(2 frac{11}{13} - 18 frac{7}{13} div 10 frac{1}{24} ) div frac{15}{62} - 2.4 = ( frac{37}{13} - frac{241}{13} div frac{241}{24} ) div frac{15}{62} - frac{24}{10} = ( frac{37}{13} - frac{241}{13} times frac{24}{241} ) times frac{62}{15} - frac{24}{10} = ( frac{37}{13} - frac{24}{13} ) times frac{62}{15} - frac{24}{10} = frac{13}{13} times frac{62}{15} - frac{24}{10} = frac{62}{15} - frac{24}{10} = frac{62 times 2 - 24 times 3}{30} = frac{124 - 72}{30} = frac{52}{30} = 1 frac{22}{30}$
285.
$frac{y}{2.8 + 8.7} = frac{ 2frac{3}{5} }{10 - 7.7} \ frac{y}{11.5} = frac{2.6}{2.3} \ y times 2.3 = 11.5 times 2.6 \ y = frac{29.9}{2.3} = frac{299}{23} = 13$