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Turunan
19. Pecahan y = (ax+b)/(cx+d)
y' = (ad-bc)/(cx+d)²

f(x)= (4x-2)/(3x+1)
f '(x) = {4(1) - 3(-2) }/(3x+1)²
f'(x) = (4+6)/(3x+1)²
f '(x)= 10/(3x+1)²

20.  f(x)= ( g(x))ⁿ
f'(x)= n  (g(x))ⁿ⁻¹ .  g'(x)

f(x) = (2x-3)⁴
f '(x) = 4 (2x-3)³ (2)
f ' (x)= 8(2x-3)³

21. Pecahan f(x) = (3x-4)/(2x+5)
f '(x)  = {3(5) -2(-4)} / (2x+5)²
f '(x)= (15 + 8) / (2x+5)²
f ' (x)= (23)/(2x+5)²