236

ա) 7/x2+x+12 – 6/x2+2x-8 = 0

7(x2+2x-8)-6(x2+x+12)= 0

7×2+14x-56-6×2-6x-72=0

x2-8x-128=0

D=64+512=576=24×24

x1=8+24/2=16

x2=8-24/2=-8

բ) 2/a+10/a2-2a=1+2a/a-2 Թաբ a≠0

2(a-2)+10-a(1+2a)/a(a-2) =

2a-4+10-a-2a2/a(a-2) =

-2a2+a+6/a(a-2) =

-2a2+a+6=a2-2a

3a2-3a-6=0

a2-a-3=0

D=4

a1=1+2=2=1,5

a2=1-2/2=-0,5

Պատ.՝1,5