А). (8х-3)(4х+5) = 32х² +40х -12х - 15 = 32х² + 28х - 15
б). 8х-3×4х+5 = 8х - 12х + 5 = -4х +5
в). (4а-3)×2а-3 = 8а² - 6а -3
<span>г). 4а-3(2а-3) = 4а - 6а - 9 = -2а-9</span>
(6b-8)*(8b+6)-8b*(6b+8)=48b^2+36b-64b-48-48b^2-64b=
=48b^2-28b-48-48b^2-64b=-92b-48
-92*(-8,2)-48=706,4