Б) 3(3х-5)/2 - 4х-1/3 +2=0;
6x-15/6-8x-2/6+2=0;
6x-15-8x+2/6 +2;
-2x-13/6 +2;
6(-2x-13)/6 +2*6;
-2x-13+12;
-2x=1
x=-1/2
А). 25а^2 - (а+3)^2 =
(5а) ^2 - (а+3)^2 =
(5а + а + 3)(5а - а - 3) =
(6а+3)(4а-3) =
3(2а+1)(4а-3)
б). 27а^3 + b^3 =
(3а) ^3 + b^3 =
<span>(3а+b)(9а^2 - 3аb + b^2)</span>