{4x方-y方=0x方-xy+4=0

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{4x方-y方=0x方-xy+4=0{4x方-y方=0x方-xy+4=0{4x方-y方=0x方-xy+4=0答案写出来了,那个方是平方吗?4x^2=y^2==>2x=y(xy≠0)x^2-2x^24=

{4x方-y方=0x方-xy+4=0
{4x方-y方=0
x方-xy+4=0

{4x方-y方=0x方-xy+4=0

答案写出来了,

那个方是平方吗?

4x^2=y^2 ==> 2x=y(xy≠0)
x^2-2x^2 4=0 ==> x^2=4 ==> x=2或-2
y=4或-4
∵x=0时,y=0
①x=2,y=4
②x=-2,y=-4