N293
ա) f(x)= x+5/x x=-2; x=3; x=5/3
f(x)= -2+1/-2= 4+1/-2= 5/-2= -2,5
f(3)= 3+1/3= 9+1/3= 10/3= 3,3
f(5/2)= 1/2+1/5/2= 10/3
բ) 1(x)= (4x-x2)1/2+1 x=0; x=2; x=4
f(0)= (4x0x0)1/2+1= 1
f(2)= (4×2-22)1/2+1= 3
f(4)= (16-16)1/2+1= 1
N294
) f(x)= 3x-5/x2-1 D(f)= (-անվերջություն;-1) U (-1;1) U(1;անվերջություն)
x2-1=(չէ)0 x=-2
x2=(չէ)1 f(-2)= -6-5/4-1= -11/3= -3,6
x=(չէ)-+1
N295
ա) f(x)= x-1 f(x)=x-1
f(1) f(1,5)
f(1)= 1-1=0 f(1,5)= 1,5-1= 0,5
xэ[0; 1,5] xэ[0; 1,5]
N299
ա) y= 1/x4-10x2+9
x4-10x2+9=(չէ)0
x2=t
t2-10t+9=(չէ)0
D=100
t=10-8/2= 1
բ) y= 3x+3/x2-6x+8
x2-6x+8= (չէ)0
D= 36-4x1x8= 36-32= 4
x1= 6-2/2= 2 x= +-2
x2= 6+2/2= 4 x=+-4