Zadanka - matematyka.

Question

Witam czy ktos pomoze mi rozwiazac ktores z tych zadan?

 http://ofu.pl/xx7qen27

Answer 1

Zad 5.
Obliczam wartość dla x=-1
a)2x²-6x-10 : x² + 3x = 2+6-10 : 1-3 = -2 : -4 = 1/2
b)x³-3x+3 : 1/2x²-1=5: (-0,5)= - 10
c)4x²+8x  :1/4x³-1/2= -4 : -1/4 - 2/4 = -4: - 3/4 = 5 i 1/3
d)4x³+4x²+x : 2x² - 7x-4 = 0 : (-10)=0

Obliczam wartość dla x=-2
a)2x²-6x-10 : x² + 3x =8+12-10 : 4 -6 = 10 : (-2) = -5
b)x³-3x+3 : 1/2x²-1= -8+6 +3 :2-1 = 1:1=1
c)4x²+8x  :1/4x³-1/2=16-16 : (-2)- 1/2 = 0
d)4x³+4x²+x : 2x² - 7x-4 = -32+16-2 : 4+14-4= - 18 : 14 = -18/14 = -1 i 4/14

Zad 6.
Oblicz f(-3)
a) f(x)= x²+2x : x²-4 = (-3)²+2*(-3) : (-3)²-4=9-6 : 9-4=3 : 5 = 3/5
b)f(x)=x²+21 : x²-3= (-3)²+21 : (-3)²-3=30:6=5
c)f(x)=4x+2 : x²-x-2=4(-3)+2 : (-3)²+3-2=10 : 10 = 1

Oblicz f(1)
a) f(x)= x²+2x : x²-4 = 1+2:1-4= - 1
b)f(x)=x²+21 : x²-3=22: (-2)= - 11
c)f(x)=4x+2 : x²-x-2=6:0=0

Oblicz f(3)
a) f(x)= x²+2x : x²-4 =9+6 : 9-4=15 : 5 = 3
b)f(x)=x²+21 : x²-3=30 : 6= 5
c)f(x)=4x+2 : x²-x-2=14:4 = 14/4 = 3 2/4 = 3 i 1/2

Powtórzenie:
Zad 3
a) = 3/6+4/6+5/6=12/6=2
b) =18/12+4/12+33/12=55/12 = 4 i 7/12
c) =9/4+49/16=36/16+49/16=85/16= 5 i 5/16
d) = 90/18+60/18=150/18 = 8 i 6/18 = 8 i 1/3

Zad.4
a) = 3/6-2/6+m=0
 m= -1/6
b)=8/20-15/20+m=0
m= 7/20
c)=16/12 - 27/12-2m=0
-2m= -11/12
m= - 11/24
d)=14/6-7/6+7/3m=0
7/3m= - 7/6 / * 3/7
m=  - 1/2