Question

Ajutor repede,va rog!!!!!!​

Answer 1

Explicație pas cu pas:

1.

(3x-2)/(x+4)=(x+4+2x-6)/(x+4)=(x+4)/(x+4)+(2x-6)/(x+4)=

=1+2(x-3)/(x+4)=1+2*(x+4-7)/(x+4)=1+2((x+4)/(x+4)-7(x+4))=

=1+2(1-7/(x+4)=3-14/(x+4)

D{14}={14,7,2,1}∈N

x+4=14⇒x=10

x+4=7⇒x=3

x+4=2⇒x=-2∉N

x+4=1⇒x=-3∉N

C={3,10}

2.

(4x+3)/(5x-1)

5x-1 |4x+3

5x-1 | 5(4x+3)-4(5x-1)

5x-1 | 20x+15-20x+4

5x-1 |19

5x-1∈D{19}

5x-1∈{1,19} | +1

5x∈{2,20} |:5

x∈{4}

D={4}

Bafta!