2x-y=6 (1)
x的两次方-5xy+6y方=0 (2)
由(1)得y=2x-6 (3)
由(2)得(x-2y)(x-3y)=0 (4)
(3)代入(4)得
(x-4x+12)(x-6x+18)=0
x=4 x=3.6
把x=4.y=3.6代入(3)得
x=4 x=3.6
y=2 y=1.2
2x-y=6 (1)
x的两次方-5xy+6y方=0 (2)
由(1)得y=2x-6 (3)
由(2)得(x-2y)(x-3y)=0 (4)
(3)代入(4)得
(x-4x+12)(x-6x+18)=0
x=4 x=3.6
把x=4.y=3.6代入(3)得
x=4 x=3.6
y=2 y=1.2