10a^2+a-7+2a-a^2-3a+3=9a^2-4=9*1/9-4=1-4=-3
Х(4-4х^2)=0
х=0 4-4х^2=0
(2-2х)((2+2х)=0
2-2х=0 2+2х=0
-2х=-2 2х=-2
х=1 х=-1
Ответ: х1=0, х2=1, х3=-1
D= 9+ 4*108=441
x1= -3-21/2=-24/2=-12
х2=-3+21/2=18/2=9
Ответ: -12, 9.
1)фи(x) = f(x)+g(x)
фи(3) = f(3)+g(3) = 1+9 = 10
фи(1) = f(1)+f(1) = 5+1 = 6
2)r(x) = f(x)•g(x)
r(2) = f(2)•g(2) = 3•4 = 12
r(4) = f(4)•g(4) = -1•16 = -16
19/25=0,76≈0,8 )))))))))))))))))))))))))))