1. (2*1,2+3*1,3)1,2 (2,4+3,9)1,2 7,56
---------------------- - 1,3 = ---------------- - 1,3= ------- - 1,3 = 75,6-1,3=74,3
1,3 - 1,2 0,1 0,1
9х²<span>+6х+1-3х-1=0
</span>9х²+3х=0
3х(3х+1) = 0
3х = 0
х₁ = 0
3х+1 = 0
3х = -1
х₂ = -1/3
-9+1,5х+2х+6+4,5х-0,9=8х-3,9