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已知x^2-4x+y^2+6y+13=0求x^2-2xy+y^2x^2-y^2x^2-4x+y^2+6y+13=0求x^2-2xy+y^2÷x^2-y^2少个符号不好意思
题目详情
已知x^2-4x+y^2+6y+13=0求x^2-2xy+y^2x^2-y^2
x^2-4x+y^2+6y+13=0
求x^2-2xy+y^2÷x^2-y^2 少个符号不好意思
x^2-4x+y^2+6y+13=0
求x^2-2xy+y^2÷x^2-y^2 少个符号不好意思
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答案和解析
x^2-4x+y^2+6y+13=0
x^2-4x+4+y^2+6y+9=0
(x-2)^2+(y+3)^2=0
x-2=0 x=2
y+3=0 y=-3
(x^2-2xy+y^2)÷(x^2-y^2)
=(x-y)^2/[(x+y)(x-y)]
=(x-y)/(x+y)
=(2+3)/(2-3)
=-5
x^2-4x+4+y^2+6y+9=0
(x-2)^2+(y+3)^2=0
x-2=0 x=2
y+3=0 y=-3
(x^2-2xy+y^2)÷(x^2-y^2)
=(x-y)^2/[(x+y)(x-y)]
=(x-y)/(x+y)
=(2+3)/(2-3)
=-5
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