已知x^2-y^2=6,x+y=3求x.y的值
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已知x^2-y^2=6,x+y=3求x.y的值已知x^2-y^2=6,x+y=3求x.y的值已知x^2-y^2=6,x+y=3求x.y的值x=2.5y=0.5忘好评谢谢x=5/2,y=1/2x为二分之
已知x^2-y^2=6,x+y=3求x.y的值
已知x^2-y^2=6,x+y=3求x.y的值
已知x^2-y^2=6,x+y=3求x.y的值
x=2.5 y=0.5 忘好评谢谢
x=5/2,y=1/2
x为二分之五 y为二分之一
X=5/2 Y=1/2 分析:根据x+y=3得 y=3-x 然后将y=3-x代入到x^2-y^2=6中,化简得6X-15=O即X=5/2 Y=3-X=1/2
秒回啊,速速采纳啊!
(X+Y)(X-Y)=6
∵(X+Y)=3
∴3(X-Y)=6∴X-Y=2,X+Y=3解得X=5/2,Y=1/2
(x+y)(x-y)=6
3(x-y)=6
(x-y)=2
列方程组
x+y=3
x-y=2
解得 x=5/2 y=1/2
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