Question

помогите! даю 35 баллов

Answer 1

Пошаговое объяснение:

$1)a) \frac{16.8}{4.8} = \frac{168}{48} = \frac{7}{2} = 3 \frac{1}{2} = 7.5 \\ b) \frac{11}{3 \frac{1}{5} } = 11 \div \frac{16}{5} = \frac{11 \times 5}{16} = \frac{55}{16} = 3 \frac{7 \times 625}{16 \times 625} = 3 \frac{4375}{10000} = 3.4375$

$2) \frac{3.2 \times 2.3 \div 0.4 - 4.4}{ \frac{2}{3} \times \frac{1}{3} + \frac{5}{9} } = \frac{ \frac{32 \times 23 \times 10}{10 \times 10 \times 4} - 4.4}{ \frac{2}{9} + \frac{5}{9} } = \frac{ \frac{184}{10} - 4.4}{ \frac{7}{9} } = \frac{18.4 - 4.4}{ \frac{7}{9} } = \frac{14 \times 9}{7} = 18$

$3) \frac{x}{3.8 + 2.7} - \frac{13.2 - 6.7}{x} = \frac{x}{6.5} - \frac{6.5}{x} = \frac{ {x}^{2} - 42.25 }{6.5x} \\ \\ a) \frac{ {6.5}^{2} - 42.25}{ {6.5}^{2} } = \frac{0}{ {6.5}^{2} } = 0 \\ b) \frac{ {26 }^{2} - 42.25}{6.5 \times 26} = \frac{(26 - 6.5)(26 + 6.5)}{6.5 \times 26} = \frac{19.5 \times 32.5}{169} = \frac{633.75}{169} = 3.75$