4x^2+y^2+4xy+12x-6y+9=0如题..应该没错,如果错了,老师会说
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4x^2+y^2+4xy+12x-6y+9=0如题..应该没错,如果错了,老师会说
4x^2+y^2+4xy+12x-6y+9=0
如题..
应该没错,如果错了,老师会说
4x^2+y^2+4xy+12x-6y+9=0如题..应该没错,如果错了,老师会说
4x^2+y^2+4xy+12x-6y+9=0
(2x+y)^2+6(2x+y)+9-12y=0
(2x+y+3)^2=12y
同时:
4x^2+y^2+4xy+12x-6y+9=0
(2x-y)^2+6(2x-y)+9+8xy=0
(2x-y+3)^2=-8xy
4x^2+y^2+4xy+12x-6y+9
=(2x+y)^2+6*(2x-y)+9
=(2x+y-3)^2=0
所以2x+y-3=0
题目错了吧
如果是
4x^2+y^2+4xy+12x+6y+9=0
则(2x+y)^2+6(2x+y)+9=0
(2x+y+3)^2=0
2x+y+3=0
如果是
4x^2+y^2+4xy-12x-6y+9=0
则(2x+y)^2-6(2x+y)+9=0
(2x+y-3)^2=0
2x+y-3=0
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