Question

1. Обчисли. допоможіть будь-ласка ​

Answer 1

$13 \frac{4}{5 } \times 1 \frac{7}{23} - ( \frac{3}{4} ) {}^{2} = \frac{69 \times 30}{5 \times 23} - \frac{9}{16} = 18 - \frac{9}{16} = 17 \frac{16}{16} - \frac{9}{16 } = 17 \frac{7}{16}$

$(11 \frac{1}{4} -8 \frac{4}{5} ) \times ( \frac{3}{7} ) {}^{2} = (11 \frac{5}{20} - 8 \frac{16}{20} ) \times \frac{9}{49} = (10 \frac{25}{20} - 8 \frac{16}{20} ) \times \frac{9}{49} = 2 \frac{9}{20} \times \frac{9}{49} = \frac{49 \times 9}{20 \times 49} = \frac{9}{20} = 0.45$