<span>y=(1-3x^2) ^1/3
y'=1/3(1-3x</span>^2)^(-2/3)*(-6x)=4x/3*(1-3x^2)^(-2/3)
Y`=2x*e^(-2)-2e^(-2)*x²=2x*e^(-2)*(1-x)=0
e^(-2x)>0 при любом х
x=0 x=1
_ + _
------------------(0)-------------(1)-------------
возрастает при x∈[0;1]
Ответ E
3/7 и 4/21
3/7 = 9/21
9/21 > 4/21
7x² + x - 8 = 0
D = 1² - 4 × 7 × (-8) = 1 + 224 = 225 > 0,
x1 = (-1 + 15) / (2×7) = 14 / 14 = 1
x2 = (-1-15) / (2×7) = -16 / 14 = -8/7
Ответ: x1 = 1, x2 = -8/7.