Question

математика 40 баллов
a) (1 18/25-9,12-7,4*(-6 1/3)):5 1/3=

Answer 1

$1) : : 1 frac{18}{25} - 9.12 = frac{43}{25} - 9 frac{12}{100} = frac{43}{25} - 9 frac{3}{25} = frac{43}{25} - frac{228}{25} = - frac{185}{25} = - frac{37}{5} \ 2) : : 7.4 times ( - 6 frac{1}{3} ) = frac{74}{10} times ( - frac{19}{3} ) = - frac{37 times 19}{5 times 3} = - frac{703}{15} \ 3) - frac{37}{5} - ( - frac{703}{15} ) = - frac{37}{5} + frac{703}{15} = - frac{111}{15} + frac{703}{15} = frac{592}{15} \ 4) : : frac{592}{15} div 5 frac{1}{3} = frac{592}{15} div frac{16}{3} = frac{592}{15} times frac{3}{16} = frac{37}{5} = 7.4$
Ответ: 7,4.

Answer 2

$displaystyle tt bigg(1frac{18}{25}-9,12-7,4cdot bigg(-6frac{1}{3}bigg)bigg):5frac{1}{3}=bigg(1,72-9,12+frac{74}{10}cdotfrac{19}{3}bigg)cdotfrac{3}{16}=\\\=bigg(frac{74}{10}cdotfrac{19}{3}-frac{74}{10}bigg)cdotfrac{3}{16}=frac{74}{10}cdotfrac{3}{16}cdot bigg(frac{19}{3}-1bigg)=frac{74}{10}cdotfrac{3}{16}cdotfrac{16}{3}=frac{74}{10}=7,4;$