Question

3. Проверь равенство.
(1,5 - 0,1) (1,5 +0,1)= 1,5² - 0,1²
.

Answer 1

разность квадратов:

${a}^{2} - {b}^{2} = (a - b) \times (a + b)$

$(1.5 - 0.1) \times (1.5 + 0.1) = 1.4 \times 1.6 = (14 \times 16) \div 100 = 2.24$

${1.5}^{2} - {0.1}^{2} = (1.5 \times 1.5) - (0.1 \times 0.1) = 2.25 - 0.01 = 2.24$

$2.24 = 2.24$