4 2/7 - 1 4/9 = 30/7 - 13/9 =(30 × 9 - 13 × 7)/63 = 270/63 - 91/63 = 179/63 = 2 53/63
0,2-1/3*2=0,2-2/3=2/10-2/3=1/5-2/3=(3-10)/15=-7/15.....
Я так поняла вроде
1)f`(x)=5
2)f`(x)=3
3)f`(x)=10x+20x^4
Решение
(- 16x³¹ / 9y³)³ : (8x²³/3y²)⁴ = - (2¹² * x⁹³ * 3⁴ * y⁸) / (3⁶ * y⁹ * 2¹² * x⁹²) =
= (- x) / (3² * y) = - x / (9y)
( X - 5 )*( X - 3 ) = 0
X^2 - 3X - 5X + 15 = 0
X^2 - 8X + 15 = 0