Question

Решите умоляю пожалуйста

Answer 1

▪1.а

$(0.5a - 2b) ^{2} = 0.25 {a}^{2} - 2ab + 4 {b}^{2}$

▪1.б

$(a - frac{3}{4} b)(frac{3}{4} b + a) = {a}^{2} - frac{9}{16} {b}^{2}$

▪2.

$2( {x + 1)}^{2} - (x - 3)(x + 3) = 7 + {x}^{2} \ 2( {x}^{2} + 2x + 1) - ( {x}^{2} - 9) = 7 + {x}^{2} \ 2 {x}^{2} + 4x + 2 - {x}^{2} + 9 - 7 - {x}^{2} = 0 \ 4x + 4 = 0 \ 4(x + 1) = 0 : : : : : | div 4 \ x + 1 = 0 \ x = - 1$

▪3.

$frac{ {a}^{2} - 10a + 25}{a - 5} = frac{ {(a - 5)}^{2} }{a - 5} = a - 5 \ \ a - 5 = 1.5 - 5 = - 3.5$