Question

Вычислите :

48² - 12²
_________________ = ?
89² + 2 • 31 • 89 + 31²
​

Answer 1

Ответ:

$\frac{48 {}^{2} - 12 {}^{2} }{89 {}^{2} + 2 \times 31 \times 89 + 31 {}^{2} } = \frac{(48 - 12)(48 + 12)}{7921 + 5518 + 961} = \frac{36 \times 60}{14400} = \frac{2160}{14400} = \frac{3}{20} = 0.15$