∴
lim |
x→3 |
2x−3f(x) |
x−3 |
=
lim |
x→3 |
2x−3f(3)+3f(3)−3f(x) |
x−3 |
=
lim |
x→3 |
2x−3×2 |
x−3 |
lim |
x→3 |
−3(f(x)−f(3)) |
x−3 |
=
lim |
x→3 |
lim |
x→3 |
f(x)−f(3) |
x−3 |
=2-3f′(3)
=2-3×(-2)
=8.
lim |
x→3 |
2x−3f(x) |
x−3 |
lim |
x→3 |
2x−3f(x) |
x−3 |
lim |
x→3 |
2x−3f(3)+3f(3)−3f(x) |
x−3 |
lim |
x→3 |
2x−3×2 |
x−3 |
lim |
x→3 |
−3(f(x)−f(3)) |
x−3 |
lim |
x→3 |
lim |
x→3 |
f(x)−f(3) |
x−3 |