|x+y-5|+(x-y-3)=0,求x-y的值
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|x+y-5|+(x-y-3)=0,求x-y的值
|x+y-5|+(x-y-3)=0,求x-y的值
|x+y-5|+(x-y-3)=0,求x-y的值
x+y-5=0 (1) x-y-3=0 (2) (1)+(2) 2x-8=0 x=4 (1)-(2) y=1 x^2-y^2=16-1=15