А) 2, 4, 6, 8, 10
б) 3, 6, 9, 12, 15
в) 4, 8, 12, 16, 20
г) 5, 10, 15, 20
д) 9, 18, 27, 36, 45
е) 10, 20, 30, 40, 50
ж) 6, 12, 18, 24, 30
з) 12, 24, 36, 48, 60
и) 10, 20, 30, 40, 50
к) 36, 72, 108, 144, 180
F(x) = - 2x^2-x+1
f(x) = 0
-2x^2-x + 1 = 0
a = -2, b = -1, c = 1
D = b^2 - 4ac
D = 1 + 8 = 9^2 = 3
x1,2 = -b+/-D/2a
x1= 1+3/-4 = 4/-4 = - 1
x2 = 1-3/-4 = -2/-4 = 1/2 = 0.5
f(-1) = - 2 + 1 +1 = 0
f(0.5) = -2*0,5^2 - 0,5 + 1 = -0,5 - 0,5 + 1 = 1+1 = 0
1 1/6
либо 1,16
так как 1:6= 0, 16
16/21-5 1/3=16/21-16/3=16/21-16/3×7/7=16/21-112/21= - 96/21=- 32/7=
=- 4 4/7
1)2cos4x+√2=0
2cos4x=-√2
cos4x==-√2/2
a)4x=3π/4+2kπ, x=3π/16+kπ/2, k∈Z
b)4x=5π/4+2kπ,x=5π/16+kπ/2,k∈Z
(cos 135°=-√2/2, cos 225°=-√2/2)
2)y=2sin3xcos3x-5x²=sin6x-5x²
y´=6cos6x-10x
(2sinαcosα=sin2α)