已知x²+y²=-2xy,求x-y/x+3y的值.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 20:55:45
![已知x²+y²=-2xy,求x-y/x+3y的值.](/uploads/image/z/5934763-19-3.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3B%2By%26%23178%3B%3D-2xy%2C%E6%B1%82x-y%EF%BC%8Fx%2B3y%E7%9A%84%E5%80%BC.)
xRKJ@ HB۶Y(9@nvap1A fʸQ4sU`udUW{UATac}ǰyblH-HFāN߲%m 0*I-N%Z&GG2M=jjn嬼VK/#|\>s_7F2b%ĉJF܁{am-GW8:Rp(j z}ѣp$.tH%!,2ȡ{2n$
已知x²+y²=-2xy,求x-y/x+3y的值.
已知x²+y²=-2xy,求x-y/x+3y的值.
已知x²+y²=-2xy,求x-y/x+3y的值.
x²+y²+2xy=0
(x+y)²=0
x+y 所以x=-y
所以x-y/x+3y=-y-y/-y+3y
=-2y/2y
=-1
有不明白的你可以问我
x²+y²=-2xy
x²+y²+2xy=0
(x+y)²=0
x=-y
x-y=x+x=2x
x+3y=x-3x=-2x
(x-y)/(x+3y)=2x/(-2x)=-1
(x+y)²=0,x=-y
(x-y)/(x+3y)=-2y/(2y)=-1
由于x²+y²=-2xy,X+Y=0,X=-Y。
(X-Y)/(X+3Y)=2X/-2Y=-1
x²+y²=-2xy
x²+y²+2xy=0
(x+y)²=0
x+y=0
x=-y
x-y/x+3y
=(-y-y)/(-y+3y)
=-1