Question

matematica clasa a IX ajutor va rog este urgent dau coroana si 100 puncte​

Answer 1

Răspuns:

1.

delta=(-5)^2 - 4•1•6=1

x1=(5-1)/2=2

x2=(5+1)/2=3

(x-2)(x-3)

2.

delta=8^2 - 4•1•15=4

x1=(-8-2)/2=(-5)

x2=(-8+2)/2=(-3)

(x+5)(x+3)

3.

x#3

x+1=2x-6 ; -x=-7 ; x=7

4.

2x+4=21x-6 ; -19x=-10 ; x=10/19

5.

Numitor comun 30

(6+3-2)/30 = 7/30

6.

Numitor comun 24

(6+16+3)/24 = 25/24

7.

Numitor comun 12

3x+9-6x+12=2 ; -3x=-19 ; x=19/3