六、作业
解下列方程组:
x2 - 2xy - 3y2 = 0,
1.(1)
1
y = 2 x2 ;
x 2 - 4xy + 3y2 = 0,
(2) 2 2
x + y = 10.
x2 +2xy + y2 = 25,
2. (1) 2 2
9x - 12xy+4y = 9;
x2 + 2xy + y 2 = 9,
(2)(x − y) 2 − 3(x − y) − 10 = 0.
(单志惠)
解下列方程组:
x2 - 2xy - 3y2 = 0,
1.(1)
1
y = 2 x2 ;
x 2 - 4xy + 3y2 = 0,
(2) 2 2
x + y = 10.
x2 +2xy + y2 = 25,
2. (1) 2 2
9x - 12xy+4y = 9;
x2 + 2xy + y 2 = 9,
(2)(x − y) 2 − 3(x − y) − 10 = 0.
(单志惠)