Question

Якласс
помогите срочно

Answer 1

Ответ:

$( \frac{1}{7} x - \frac{3}{11} y) \times ( \frac{1}{7} x + \frac{3}{11} y) =\left(\frac{1}{7}x\right)^{2}-\left(\frac{3}{11}y\right)^{2} =\left(\frac{1}{7}\right)^{2}x^{2}-\left(\frac{3}{11}y\right)^{2} =\frac{1}{49}x^{2}-\left(\frac{3}{11}y\right)^{2} =\frac{1}{49}x^{2}-\left(\frac{3}{11}\right)^{2}y^{2} =\frac{1}{49}x^{2}-\frac{9}{121}y^{2}$