Question

Решите пожалуйста срочно.

Answer 1

${a}^{2} + 2ab + {b}^{2} - 9 {a}^{2} + \\ + 6ab - {b}^{2} + 4 {b}^{2} - {a}^{2} + \\ + 10 {a}^{2} - 10ab + 4ab - 4 {b}^{2} + {b}^{2} = \\ = {a}^{2} + 2ab + {b}^{2} = \\ = {(a + b}^{2} =$
${( - 8 \frac{17}{20} + 4 \frac{17}{20} )}^{2} = {( - 4)}^{2} = 16$