Question

(2-3/20)*(3 3/20) (4-3/20)*(5-3/20)
Номер 3 вариант 3

Answer 1

$(2 - x)(3 + x) + (4 - x)(5 - x) \\ 6 + 2x - 3x - x {}^{2} + 20 - 4x - 5x + x {}^{2} \\ 26 - 10x \\ 26 - 10 \times \frac{3}{20} = 26 - \frac{3}{2} = \frac{49}{2} = 24 \frac{1}{2} = 24.5$