Question

Очень СРОЧНО! Алгебра 7 класс! Задание в фото!

Answer 1

3,8(8,2^2 - 1.8^) / 1.9(5.3^2 - 4.7^2) = 2* ((37.24 - 3.24)/( 28.09-22.09)) = 2*61 / 6 = 61/3

Answer 2

$\frac{3.8*8.2^2-3.8*1.8^2}{1.9*5.3^2-1.9*4.7^2}= \frac{3.8*(8.2^2-1.8^2)}{1.9*(5.3^2-4.7^2)}= \frac{2*1.9*(8.2-1.8)*(8.2+1.8)}{1.9*(5.3-4.7)*(5.3+4.7)}=\\\\ =\frac{2*(8.2-1.8)*10}{(5.3-4.7)*10}=\frac{2*(8.2-1.8)}{5.3-4.7}=\frac{2*6.4}{0.6}=\frac{2*64}{6}=\frac{2*64}{2*3}=\frac{64}{3}$