x |
x?3 |
x+6 |
x(x?3) |
1 |
x |
=
x2 |
x(x?3) |
x+6 |
x(x?3) |
x?3 |
x(x?3) |
=
x2?x?6+x?3 |
x(x?3) |
=
x2?9 |
x(x?3) |
=
(x?3)(x+3) |
x(x?3) |
=
x+3 |
x |
當(dāng)x=300時,原式=
303 |
300 |
101 |
100 |
故選D.
x |
x?3 |
x+6 |
x2?3x |
1 |
x |
101 |
990 |
111 |
110 |
101 |
100 |
x |
x?3 |
x+6 |
x(x?3) |
1 |
x |
x2 |
x(x?3) |
x+6 |
x(x?3) |
x?3 |
x(x?3) |
x2?x?6+x?3 |
x(x?3) |
x2?9 |
x(x?3) |
(x?3)(x+3) |
x(x?3) |
x+3 |
x |
303 |
300 |
101 |
100 |