x^2-y^2=12,x+y=6.求x、y的值
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x^2-y^2=12,x+y=6.求x、y的值x^2-y^2=12,x+y=6.求x、y的值x^2-y^2=12,x+y=6.求x、y的值x^2-y^2=12(x+y)(x-y)=12x+y=6则x-
x^2-y^2=12,x+y=6.求x、y的值
x^2-y^2=12,x+y=6.求x、y的值
x^2-y^2=12,x+y=6.求x、y的值
x^2-y^2=12
(x+y)(x-y)=12
x+y=6
则x-y=2
解出 x=4,y=2
前一个式子可由平方差公式拆成(x+y)(x-y)=12,
把后面的式子x+y=6代入(x+y)(x-y)=12,
得x-y=2,与x+y=6连立方程组
最后x=4,y=2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
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