Question

38.8 упростите дробно-рационалное выражение 2 4 6

Answer 1

$2) frac{8p - 40}{15 - 3p} = frac{8(p - 5)}{-3(-5 +p)} = frac{8(p-5)}{-3(p-5)} = frac{8}{-3} = - frac{8}{3} = - 2 frac{2}{3} \ \ \ 4) frac{(3x + 6y)^2}{5x+10y} = frac{(3x+6y)(3x+6y)}{5(x+2y)} = frac{3(x+2y) * 3(x+2y)}{5(x+2y)} = \ \ = frac{9(x+2y)(x+2y)}{5(x+2y)} = frac{9(x+2y)}{5} = 1.8(x+2y) =1.8x + 3.6y \ \ \ 6) frac{a^2-6a+9}{27-a^3} = frac{a^2- 2*a*3 + 3^2}{-(a^3-3^3)} = frac{(a-3)^2}{-(a-3)(a^2+3a+3^2)} = \ \ = - frac{a-3}{a^2+3a+9}$