Question

Найдите значение дроби:​

Answer 1

Ответ:

$\frac{(38 - 17)(38 + 17)}{(72 - 16)(72 + 16)} = \frac{21 \times 55}{56 \times 88 } = \frac{3 \times 5}{8 \times 8} = \frac{15}{64} = 0.234375$

$\frac{(39.5 - 3.5)(39.5 + 3.5)}{(57.5 - 14.5)(57.5 + 14.5)} = \frac{36 \times 43}{43 \times 72} = \frac{36}{72} = \frac{1}{2} = 0.5$

$\frac{(17.5 - 9.5)(17.5 + 9.5)}{(131.5 - 3.5)(131.5 + 3.5)} = \frac{8 \times 27}{128 \times 135} = \frac{1 \times 1}{16 \times 5} = \frac{1}{80} = 0.0125$