3 |
k |
則直線y=kx-3與x軸交點(diǎn)坐標(biāo)為(
3 |
k |
3 |
k |
令x=0,得y=-3,則直線y=kx-3與y軸交點(diǎn)坐標(biāo)為(0,-3)即B(0,-3),
方法1:當(dāng)k>0時(shí),由S△AOB=
1 |
2 |
1 |
2 |
3 |
k |
解得k=
3 |
4 |
當(dāng)k<0時(shí),由S△AOB=
1 |
2 |
1 |
2 |
3 |
k |
解得k=-
3 |
4 |
所以,k=
3 |
4 |
3 |
4 |
方法2:由S△AOB=
1 |
2 |
1 |
2 |
3 |
k |
解得k=±
3 |
4 |
3 |
k |
3 |
k |
3 |
k |
1 |
2 |
1 |
2 |
3 |
k |
3 |
4 |
1 |
2 |
1 |
2 |
3 |
k |
3 |
4 |
3 |
4 |
3 |
4 |
1 |
2 |
1 |
2 |
3 |
k |
3 |
4 |