平方完成 演習2
-6k2 +42k
| 2t2 -t +4 | / √5
x2 +y2 +lx +my +n =0
x2 +y2 +5x -3y +6 =0
x2 +y2 +2px +3py +13 =0
x2 +y2 -x +y -6 =0
x2 + 4/( k+1 ) +y2 - 4/( k+1 )y -( 5k+1 )/( k+1 )=0
5k2 +6k +9
x2 +( 2t-10 )x -4t +16
x2 +y2 -2x -y =0
4t2 -4t +2
-2t2 +6t +4
25t2 +20t +5