已知实数x,y满足(x+y)^2=1,(x-y)^2=25,求x,y的值
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已知实数x,y满足(x+y)^2=1,(x-y)^2=25,求x,y的值已知实数x,y满足(x+y)^2=1,(x-y)^2=25,求x,y的值已知实数x,y满足(x+y)^2=1,(x-y)^2=2
已知实数x,y满足(x+y)^2=1,(x-y)^2=25,求x,y的值
已知实数x,y满足(x+y)^2=1,(x-y)^2=25,求x,y的值
已知实数x,y满足(x+y)^2=1,(x-y)^2=25,求x,y的值
解由(x+y)^2=1,(x-y)^2=25,知x+y=1或-1,x-y=5或-5;
当x+y=1,x-y=5时,则x=3,y=-2;
当x+y=1,x-y=-5时,则x=-2或y=3;
当x+y=-1,x-y=5时,则x=2,y=-3;
当x+y=-1,x-y=-5时,则x=-3,y=2
不是吧,题目啥意思?
6.5 -6
|x+Y|=1
|x-Y|=5
得出来四组
1、x=3 y=-2
2、x=-3 y=2
3、 x=2 y=-1
4、 x=-2 y=3
有题可知:
x+y=±1,x-y=±5
当x+y=1,x-y=5时x=3,y=-2;
当x+y=-1,x-y=-5时x=-3,y=2;
当x+y=-1,x-y=5时x=2y=-3;
当x+y=1,x-y=5时x=-2,y=3.
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