Question

Задание 10 срочно!!!

Answer 1

Ответ:

$5 {a}^{2} - 5ax - 7a + 7x = 5a(a - x) - 7(a - x) = (a - x)(5a - 7) = (4 - ( - 3))(5 \times 4 - 7) =( 4 + 3)(20 - 7) = 7 \times 13 = 91$

${m}^{2} - mn - 3m + 3n = m(m - n) - 3(m - n) = (m - n)(m - 3) = (0.5 - 0.25)(0.5 - 3) = 0.25 \times ( -2.5) = - 0.625$

Объяснение:

${a}^{2} + ab - 11a - 11b = a(a + b) - 11(a + b) = (a + b)(a - 11) = (6.6 + 0.4)(6.6 - 11) = 7 \times ( - 4.4) = - 30.8$

${a}^{2} - ab - 2a + 2b = a(a - b) - 2(a - b) = (a - b)(a - 2) = ( \frac{7}{20} - \frac{15}{100} )( \frac{7}{20} - 2) = ( \frac{35 - 15}{100} )( \frac{7 - 10}{20} ) = \frac{20}{100} \times ( - \frac{3}{20} ) = - \frac{3}{100}$