|X+Y-1|+|X-Y-3|=0 X2 + Y2 = 2是平方?

2016-06-29 9:09 am

回答 (1)

2016-06-29 9:26 am
✔ 最佳答案
Sol
|x+y-1|+|x-y-3|=0
x+y-1=0
x-y-3=0
(x+y-1)+(x-y-3)=0
2x-4=0
x=2
y=1-x=-1
x^2+y^2=4+1=5


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