Question

Срочно с решением!!!!!!!!!!!!!!!!

Answer 1

Ответ:

$2) \: \: \: (2 - c) {}^{2} - c(c + 4) = 4 - 4c + c {}^{2} - c {}^{2} - 4c = - 8c + 4 \\ - 8 \times 0.5 + 4 = 0$

$4) \: \: \: (x - 5) {}^{2} - x(10 + x) = x {}^{2} - 10x + 25 - 10x - x {}^{2} = - 20x + 25 \\ - 20 \times ( - \frac{1}{20} ) + 25 = 1 + 25 = 26$

$x {}^{3} + x - (x - 2)(x {}^{2} + 2x + 4) = x {}^{3} + x - (x {}^{3 } + 2x {}^{2} + 4x - 2x {}^{2} - 4x - 8) = x {}^{3} + x - x {}^{3} - 2x {}^{2} - 4x + 2x {}^{2} + 4x + 8 = x + 8 \\ 0.0015 \times 8 = 0.012$