∴
| 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 |