не вижу смысла упрошать, так что просто подставляю.
16 х (-0,75)² - 24 х(-0,75) х (- 5/3) + 9 x (-5/3)² - 3 -12 x (-0,75) + 9 x (- 5/3)
16 x 0.5625 + 30 +25 -3 + 9 +15
9 + 30+25-3 +9+ 15 = 85
F(x) = 2x * Sin5x
f '(x) = 2(x' * Sin5x + x (Sin5x)' ) = 2(Sin5x + x * Cos5x * (5x)') = 2(Sin5x +
+ 5x*Cos5x)
f '(π/2) = 2(Sin 5π/2 + 5π/2*Cos 5π/2) = 2[Sin(2π+π/2) + 5π/2 * Cos(2π+π/2)]=
= 2(Sin π/2 + 5π/2 * Cos π/2) = 2( 1 + 5π/2 * 0) = 2
<span>а) (4,16*1/4-5,04)*20,5=(4,16/-1,04)*20,5=(-4)*20,5=-82
б) </span><span>-(3,48*1/3-4,16)+10,3=-(3,48/-1,16)+10,3=-(-3)+10,3=13,3</span>